This page has only limited features, please log in for full access.
Aliyu M. Aliyu is a Research Fellow at the University of Huddersfield working in experimental and numerical (CFD) aspects of internal and external flows with single-phase and multiphase flows and complex geometry. He worked previously as a Research Fellow at the University of Nottingham and as a Postdoctoral Researcher at Pusan National University in South Korea. He obtained his PhD from Cranfield University and his master’s degree from the University of Manchester in Refinery Design and Operation at the School of Chemical Engineering and Analytical Science. Aliyu has published many research articles in multiphase flows, heat/mass transfer and works on varying industrial projects.
Prior to full electric conversion, internal combustion engines will still maintain a paramount position in heavy goods and earth-moving vehicles. The most promising, cleaner alternative to fossil fuels is biodiesel. While it does not require alterations in the engine design, hence no major overhaul of existing infrastructure, biodiesel is more sustainable and clean-burning than petro-diesel. Extensive research has been reported on the effect of biodiesel blends, on the operational characteristics of compression ignition (CI) engines as well as the emissions behaviour of such engines. The performance characteristics of CI engines under transient operational conditions with Biodiesel blends has had limited attention so far from researchers. In the present work, transient performance characteristics of a CI engine has been evaluated for various biodiesel blends and its effects on performance behaviour have been quantified. In addition, emission footprints of CI engines under various transient operational conditions have also been enumerated.
Belachew Cekene Tesfa; Rakesh Mishra; Aliyu M. Aliyu. Effect of Biodiesel Blends on the Transient Performance of Compression Ignition Engines. Energies 2021, 14, 5416 .
AMA StyleBelachew Cekene Tesfa, Rakesh Mishra, Aliyu M. Aliyu. Effect of Biodiesel Blends on the Transient Performance of Compression Ignition Engines. Energies. 2021; 14 (17):5416.
Chicago/Turabian StyleBelachew Cekene Tesfa; Rakesh Mishra; Aliyu M. Aliyu. 2021. "Effect of Biodiesel Blends on the Transient Performance of Compression Ignition Engines." Energies 14, no. 17: 5416.
The complex conductivity method is frequently used in hydro-/petro-/environmental geophysics, and considered to be a promising tool for characterizing and quantifying the properties of subsurface rocks, sediments and soils. We report a study on the complex conductivity characteristics of porous media containing gas hydrates through numerical modelling. The effects of the hydrate saturation, pore-water salinity and micro-distribution mode were studied, and hydrate-saturation evaluation correlations based on complex conductivity parameters were developed. A pore-scale numerical approach for developing the finite-element based models for hydrate-bearing porous media is proposed and a two-dimensional (2D) model is built to compute the complex conductivity responses of porous media under various conditions. We demonstrate that the simple 2D model can capture the dominant characteristics of the complex conductivity of hydrate-bearing porous media within the frequency range related to the induced polarization. The in-phase conductivity, quadrature conductivity and effective dielectric constant can be correlated with the saturation based on a power law in the log-log space, by which the hydrate-saturation evaluation models can be derived. A constant saturation exponent of the power-law correlation between the hydrate saturation and quadrature conductivity can be obtained when the pore-water conductivity exceeds 1.0 S/m. This is highly desirable in the hydrate-saturation models due to the variations of the pore-water conductivity in the processes of hydrate formation and dissociation. Within the framework of the complex conductivity analysis, the micro-distribution modes of hydrates in porous media can be categorized into two types. These are the fluid-suspending mode and grain-attaching mode. The in-phase conductivity exhibits significant variations under the same saturation and salinity but different micro-distribution modes, which can be attributed to the change in the tortuosity of the electrical conduction paths in the void space of porous media.
Lanchang Xing; Shuying Qi; Yuan Xu; Bin Wang; Liyun Lao; Wei Wei; Weifeng Han; Zhoutuo Wei; Xinmin Ge; Aliyu M. Aliyu. Numerical study on complex conductivity characteristics of hydrate-bearing porous media. Journal of Natural Gas Science and Engineering 2021, 104145 .
AMA StyleLanchang Xing, Shuying Qi, Yuan Xu, Bin Wang, Liyun Lao, Wei Wei, Weifeng Han, Zhoutuo Wei, Xinmin Ge, Aliyu M. Aliyu. Numerical study on complex conductivity characteristics of hydrate-bearing porous media. Journal of Natural Gas Science and Engineering. 2021; ():104145.
Chicago/Turabian StyleLanchang Xing; Shuying Qi; Yuan Xu; Bin Wang; Liyun Lao; Wei Wei; Weifeng Han; Zhoutuo Wei; Xinmin Ge; Aliyu M. Aliyu. 2021. "Numerical study on complex conductivity characteristics of hydrate-bearing porous media." Journal of Natural Gas Science and Engineering , no. : 104145.
In December 2019, the SARS-CoV-2 virus emerged and rapidly spread throughout the world. It causes the respiratory disease COVID-19 via the transmission of microbial pathogens within bio-aerosols during speaking, sneezing, and coughing. Therefore, understanding bioaerosol dynamics is important for developing mitigation strategies against droplet-induced infections. Computer modelling, using Computational Fluid Dynamics, has become a useful tool in studying and visualising the spread of atomised bio-droplets but the effect of using cloth facemasks has not been fully quantified. In this study, simulations were carried out to quantify the extent of respiratory droplet transfer with and without facemasks between a pair of ventilated rooms by a mathematical model for the first time. A 600-μm pore facemask was used, representing the porosity of a typical cloth facemask. Using the discrete phase model, the transport of ejected droplets was tracked. The results show that in the facemask cases, more than 96% of all the ejected droplets in all scenarios were trapped in the recommended 2 m social distancing radius around the human source. Correspondingly, only a maximum of 80% of droplets were deposited within the social distancing radius in the no facemask scenarios, with >20% airborne and transported to the second room. One-dimensional empirical correlations were developed for droplet concentration as a function of distance from the bioaerosol source. The models show that droplet concentration decays exponentially from the source especially in the facemask cases. The study therefore reinforces the importance of face coverings in lessening the transmission of possibly infected respiratory droplets that transmit highly infectious diseases such as COVID-19.
Aliyu M. Aliyu; Dharminder Singh; Chino Uzoka; Rakesh Mishra. Dispersion of virus-laden droplets in ventilated rooms: Effect of homemade facemasks. Journal of Building Engineering 2021, 44, 102933 -102933.
AMA StyleAliyu M. Aliyu, Dharminder Singh, Chino Uzoka, Rakesh Mishra. Dispersion of virus-laden droplets in ventilated rooms: Effect of homemade facemasks. Journal of Building Engineering. 2021; 44 ():102933-102933.
Chicago/Turabian StyleAliyu M. Aliyu; Dharminder Singh; Chino Uzoka; Rakesh Mishra. 2021. "Dispersion of virus-laden droplets in ventilated rooms: Effect of homemade facemasks." Journal of Building Engineering 44, no. : 102933-102933.
Proper selection and application of interfacial friction factor correlations has a significant impact on prediction of key flow characteristics in gas–liquid two-phase flows. In this study, experimental investigation of gas–liquid flow in a vertical pipeline with internal diameter of 0.060 m is presented. Air and oil (with viscosities ranging from 100–200 mPa s) were used as gas and liquid phases, respectively. Superficial velocities of air ranging from 22.37 to 59.06 m/s and oil ranging from 0.05 to 0.16 m/s were used as a test matrix during the experimental campaign. The influence of estimates obtained from nine interfacial friction factor models on the accuracy of predicting pressure gradient, film thickness and gas void fraction was investigated by utilising a two-fluid model. Results obtained indicate that at liquid viscosity of 100 mPa s, the interfacial friction factor correlation proposed by Belt et al. (2009) performed best for pressure gradient prediction while the Moeck (1970) correlation provided the best prediction of pressure gradient at the liquid viscosity of 200 mPa s. In general, these results indicate that the two-fluid model can accurately predict the flow characteristics for liquid viscosities used in this study when appropriate interfacial friction factor correlations are implemented.
Joseph Ribeiro; Ruiquan Liao; Aliyu Aliyu; Salem Ahmed; Yahaya Baba; Almabrok Almabrok; Archibong Archibong-Eso; Zilong Liu. A Two-Fluid Model for High-Viscosity Upward Annular Flow in Vertical Pipes. Energies 2021, 14, 3485 .
AMA StyleJoseph Ribeiro, Ruiquan Liao, Aliyu Aliyu, Salem Ahmed, Yahaya Baba, Almabrok Almabrok, Archibong Archibong-Eso, Zilong Liu. A Two-Fluid Model for High-Viscosity Upward Annular Flow in Vertical Pipes. Energies. 2021; 14 (12):3485.
Chicago/Turabian StyleJoseph Ribeiro; Ruiquan Liao; Aliyu Aliyu; Salem Ahmed; Yahaya Baba; Almabrok Almabrok; Archibong Archibong-Eso; Zilong Liu. 2021. "A Two-Fluid Model for High-Viscosity Upward Annular Flow in Vertical Pipes." Energies 14, no. 12: 3485.
Two-phase flows are common occurrences in many industrial applications. The understanding of their characteristics in industrial piping systems is vital for the efficient design, optimization, and operation of industrial processes. Most of the previous experimental studies involving the use of gamma densitometers for holdup measurements in air-water mixtures are limited to smaller diameter pipes (generally regarded as those with < 50 mm in nominal diameter). Further, very few literature report experimental data obtained using gamma desitometers. This paper presents an application of a gamma densitometer in the measurement of two-phase flow characteristics in an intermediate diameter pipe (nominal diameter between 50 mm and 100 mm). Scaled air-water experiments were performed in a 17-m long, 0.0764-m internal diameter horizontal pipe. Liquid superficial velocity ranged between 0.1–0.4 m/s while gas superficial velocity ranged from 0.3 to 10.0 m/s. The measured parameters include liquid holdup, pressure gradient, flow pattern, and slug flow features. The flow patterns observed were stratified, stratified-wavy, plug, slug, and annular flows. Plug and slug flow patterns showed good agreement with established flow pattern maps. Furthermore, the slug translational velocity was observed to increase with increasing mixture velocity, as reported by previous authors, hence establishing the reliability of the instrumentation employed. The slug body length was also measured using the gamma densitometer and was found to be within the range 24–36D with a mean length of 30.6D.
Yahaya D. Baba; Joseph X.F. Ribeiro; Aliyu M. Aliyu; Archibong Archibong-Eso; Umar D. Abubakar; Adegboyega B. Ehinmowo. Characteristics of horizontal gas-liquid two-phase flow measurement in a medium-sized pipe using gamma densitometry. Scientific African 2020, 10, e00550 .
AMA StyleYahaya D. Baba, Joseph X.F. Ribeiro, Aliyu M. Aliyu, Archibong Archibong-Eso, Umar D. Abubakar, Adegboyega B. Ehinmowo. Characteristics of horizontal gas-liquid two-phase flow measurement in a medium-sized pipe using gamma densitometry. Scientific African. 2020; 10 ():e00550.
Chicago/Turabian StyleYahaya D. Baba; Joseph X.F. Ribeiro; Aliyu M. Aliyu; Archibong Archibong-Eso; Umar D. Abubakar; Adegboyega B. Ehinmowo. 2020. "Characteristics of horizontal gas-liquid two-phase flow measurement in a medium-sized pipe using gamma densitometry." Scientific African 10, no. : e00550.
We report an experimental study has been conducted on a 52 mm internal diameter vertical riser of which is met at the riser base by a 10.5 m long. The effect of two different gas inlet configurations were tested: riser base gas injection and horizontal inline injection 40 meters upstream of the riser base. A 16×16 wire-mesh sensor was used to measure the void fraction at the riser top and we present a detailed analysis of the characteristics of flow because of the injection scheme. These include regimes and cross-sectional void fraction distributions of the time series data. Among our findings are wall-peaking gas fraction profiles at lower gas injection rates through the flowline, while core-peaking profiles were established at the same flow conditions for riser base injection. This provides valuable information that can feed into the design of downstream facilities such as slug catchers and separators.
Salem Kalifa Brini Ahmed; Aliyu M. Aliyu; Adegboyega Ehinmowo; Hoi Yeung. Effect of Riser Base and Flowline Gas Injection on the Characteristics of Gas-Liquid Two-Phase Flow in a Vertical Riser System. Day 1 Tue, August 11, 2020 2020, 1 .
AMA StyleSalem Kalifa Brini Ahmed, Aliyu M. Aliyu, Adegboyega Ehinmowo, Hoi Yeung. Effect of Riser Base and Flowline Gas Injection on the Characteristics of Gas-Liquid Two-Phase Flow in a Vertical Riser System. Day 1 Tue, August 11, 2020. 2020; ():1.
Chicago/Turabian StyleSalem Kalifa Brini Ahmed; Aliyu M. Aliyu; Adegboyega Ehinmowo; Hoi Yeung. 2020. "Effect of Riser Base and Flowline Gas Injection on the Characteristics of Gas-Liquid Two-Phase Flow in a Vertical Riser System." Day 1 Tue, August 11, 2020 , no. : 1.
Pressure gradient (PG) is vital in the design/operation of process equipment e.g. in determining pumping requirements and has direct effect on capital and running costs. Here, we report a gas–liquid experimental study using a large diameter pipeline system. Pressure was measured at two locations of each section of the upward and downward flowing sections. PG was then determined for a wide range of superficial velocities: usg = 0–30 m/s and usl = 0.07–1.5 m/s. We found varying trends in pressure gradient behaviour between upward and downward flow under similar conditions: from bubbly to annular flow. We give a theoretical account due to the different physical mechanisms. PG values based on prevailing conditions and flow direction were compared. We show that the satisfactory prediction of PG is highly dependent on flow direction and limits of experimental conditions. These factors can have important implications for the design and operation of fluid pipelines in the process, nuclear and oil and gas industries.
Almabrok Abushanaf Almabrok; Aliyu M. Aliyu; Yahaya D. Baba; Joseph X. F. Ribeiro; Archibong Archibong-Eso; Liyun Lao; Hoi Yeung. A Comparative Analysis of Upward and Downward Pressure Gradient Behaviour in Vertical Gas-Liquid Two-Phase Flows in a Large Diameter Pipe Facility. Day 1 Tue, August 11, 2020 2020, 1 .
AMA StyleAlmabrok Abushanaf Almabrok, Aliyu M. Aliyu, Yahaya D. Baba, Joseph X. F. Ribeiro, Archibong Archibong-Eso, Liyun Lao, Hoi Yeung. A Comparative Analysis of Upward and Downward Pressure Gradient Behaviour in Vertical Gas-Liquid Two-Phase Flows in a Large Diameter Pipe Facility. Day 1 Tue, August 11, 2020. 2020; ():1.
Chicago/Turabian StyleAlmabrok Abushanaf Almabrok; Aliyu M. Aliyu; Yahaya D. Baba; Joseph X. F. Ribeiro; Archibong Archibong-Eso; Liyun Lao; Hoi Yeung. 2020. "A Comparative Analysis of Upward and Downward Pressure Gradient Behaviour in Vertical Gas-Liquid Two-Phase Flows in a Large Diameter Pipe Facility." Day 1 Tue, August 11, 2020 , no. : 1.
New simulation and experimental results have been obtained and are presented for a multi-tube fin heat exchanger unit, from which semi-analytical correlations for the Fanning friction and Colburn factors were developed. The multi-tube and fin heat exchanger represents the main component of the Fan Coil Unit, an essential component of HVAC systems used for domestic and commercial heating and cooling. Improving the efficiency of the heat exchanger typically comes at the expense of higher pressure drops or costlier materials and production costs. Here, an experimental setup was designed and constructed to evaluate the thermal performance of such a heat exchanger. Geometrical modifications were explored for thermal performance enhancement. Furthermore, full three-dimensional CFD case studies of the heat exchanger were investigated to examine the effect of the geometrical features on the air side of the heat exchanger to study the effect of fin spacing, transverse and longitudinal pitches. The CFD model developed was first globally validated against experimental results. The model results were used to predict the Fanning and Colburn factors and the local fin efficiency based on the carefully selected geometric parameters. The data obtained was utilised to develop two new semi-analytical models for the Fanning and Colburn friction factors which were well within ±10% error bands and showed strong correlation coefficients of more than 98 and 97% respectively.
Miftah Altwieb; Krzysztof J. Kubiak; Aliyu M. Aliyu; Rakesh Mishra. A new three-dimensional CFD model for efficiency optimisation of fluid-to-air multi-fin heat exchanger. Thermal Science and Engineering Progress 2020, 19, 100658 .
AMA StyleMiftah Altwieb, Krzysztof J. Kubiak, Aliyu M. Aliyu, Rakesh Mishra. A new three-dimensional CFD model for efficiency optimisation of fluid-to-air multi-fin heat exchanger. Thermal Science and Engineering Progress. 2020; 19 ():100658.
Chicago/Turabian StyleMiftah Altwieb; Krzysztof J. Kubiak; Aliyu M. Aliyu; Rakesh Mishra. 2020. "A new three-dimensional CFD model for efficiency optimisation of fluid-to-air multi-fin heat exchanger." Thermal Science and Engineering Progress 19, no. : 100658.
For safety-critical industrial applications, severe-service valves are often used, and the conditions during operations can be either single phase or multiphase. The design requirements for valves handling multiphase flows can be very different to the single-phase flow and depend on the flow regime within valves. The variation in flow conditions during the operation of such valves can have a significant effect on performance, particularly in oil and gas applications where multiphase behaviour can rapidly change within the valve causing unwanted flow conditions. Current practices in designing and sizing such valves are based solely on global phase properties such as pressure drop of the bulk fluid across the valve and overall phase ratio. These do not take into account local flow conditions, as with multiphase fluids, the flow behaviour across the valve becomes more complex. In this work, well-validated computational fluid dynamics (CFD) tools were used to locally and globally quantify the performance characteristics of a severe service valve handling multiphase gas and liquid flow. Such flows are frequently encountered in process equipment found in vital energy industries e.g. process and oil & gas. The CFD model was globally validated with benchmark experiments. Two valve opening positions of 60% and 100% were considered each with 5, 10, and 15% inlet air volume fractions to simulate real life conditions. The results show that while the non-uniformity in pressure field is along expected lines, there is severe non-uniformity in the local air, water and void fraction distributions within the valve trim. To quantify the phase non-uniformities observed, an equation for the distribution parameter was defined and used to calculate its value in each localised quarter within the trim. Phase velocity and void fraction data extracted from the CFD results were also used to obtain relationships for the local void fraction distribution and flow coefficient. The detailed investigation that has been carried out allows for local flow characteristics to be determined and embedded in sizing methodology for severe-service control valve systems with multiphase gas and liquid flow.
D. Singh; A.M. Aliyu; M. Charlton; R. Mishra; T. Asim; A.C. Oliveira. Local multiphase flow characteristics of a severe-service control valve. Journal of Petroleum Science and Engineering 2020, 195, 107557 .
AMA StyleD. Singh, A.M. Aliyu, M. Charlton, R. Mishra, T. Asim, A.C. Oliveira. Local multiphase flow characteristics of a severe-service control valve. Journal of Petroleum Science and Engineering. 2020; 195 ():107557.
Chicago/Turabian StyleD. Singh; A.M. Aliyu; M. Charlton; R. Mishra; T. Asim; A.C. Oliveira. 2020. "Local multiphase flow characteristics of a severe-service control valve." Journal of Petroleum Science and Engineering 195, no. : 107557.
An experimental investigation on the hydraulic transport of sand particles in pipelines is presented in both horizontal and 30° upward inclined orientations. The pipe, with an internal diameter of 0.0254 m, had sand transported in various water superficial velocities at low and high sand concentrations [0.1%–10% volume-to-volume ratio (v/v)]. Sand particles were polydisperse (144–250 μm) with a d95 of 210 μm. The minimum transport condition (MTC) was determined by means of video recordings and pressure gradient (PG) measurements. MTC and PG were observed to increase with increase in sand concentration and mixture velocity. At high sand concentrations, there was a decline in PG with decrease in flow velocity until a minimum is reached around the MTC. The MTC at which this occurs is different in the two pipe orientations. Based on a previously reported dimensionless relationship, a correlation was derived now including the effect of pipe inclination using extensive literature data in addition to the current. The effect of key flow, geometric, and particle parameters were adequately captured in the improved closure relationship for sand minimum transport conditions in pipes.
A. Archibong-Eso; A. M. Aliyu; W. Yan; N. E. Okeke; Y. D. Baba; O. Fajemidupe; H. Yeung. Experimental Study on Sand Transport Characteristics in Horizontal and Inclined Two-Phase Solid-Liquid Pipe Flow. Journal of Pipeline Systems Engineering and Practice 2020, 11, 04019050 .
AMA StyleA. Archibong-Eso, A. M. Aliyu, W. Yan, N. E. Okeke, Y. D. Baba, O. Fajemidupe, H. Yeung. Experimental Study on Sand Transport Characteristics in Horizontal and Inclined Two-Phase Solid-Liquid Pipe Flow. Journal of Pipeline Systems Engineering and Practice. 2020; 11 (1):04019050.
Chicago/Turabian StyleA. Archibong-Eso; A. M. Aliyu; W. Yan; N. E. Okeke; Y. D. Baba; O. Fajemidupe; H. Yeung. 2020. "Experimental Study on Sand Transport Characteristics in Horizontal and Inclined Two-Phase Solid-Liquid Pipe Flow." Journal of Pipeline Systems Engineering and Practice 11, no. 1: 04019050.
Oil and gas activities across the globe now take place deep offshore. To operate in this harsh environment, there are numerous challenges. These can be in the form of high cost of production, space constraints, operational and technological demands. The co-transportation of oil and gas in same pipeline is one of the operational and technological approaches adopted in the industry to meet the transportation of produced crude. This approach comes with its attendant flow assurance difficulties. Slugging is one of such problems which can constitute operational hitches resulting in production reduction and sometimes eventual plant shutdown. Existing attenuation techniques are limited in various ways. Therefore, seeking a reliable solution to this problem is highly desired.In this study, an experimental study of multiple techniques for slug attenuation was attempted. A passive device-the intermittent slug absorber, topside choking and topside separator were investigated. The results show that a combination of the methods proves to be more effective compared to individual techniques. A significant reduction in riser- base pressure of up to 39% was achieved. This is advantageous and translates to an increase in oil recovery. Thus, the proposed strategy helps to achieve system stability and improved production at a lower cost.
Adegboyega B Ehinmowo; E.T Evwierhoma; Aliyu M. Aliyu; Yahaya D. Baba; Aliyu Aliyu. A reliable strategy for slug flow attenuation in pipeline-riser systems. Journal of Physics: Conference Series 2019, 1378, 042103 .
AMA StyleAdegboyega B Ehinmowo, E.T Evwierhoma, Aliyu M. Aliyu, Yahaya D. Baba, Aliyu Aliyu. A reliable strategy for slug flow attenuation in pipeline-riser systems. Journal of Physics: Conference Series. 2019; 1378 (4):042103.
Chicago/Turabian StyleAdegboyega B Ehinmowo; E.T Evwierhoma; Aliyu M. Aliyu; Yahaya D. Baba; Aliyu Aliyu. 2019. "A reliable strategy for slug flow attenuation in pipeline-riser systems." Journal of Physics: Conference Series 1378, no. 4: 042103.
Gas void fraction plays a significant role in determination of several multiphase flow parameters. Good insight of its behaviour coupled with accurate prediction is imperative for design of efficient equipment which has the potential to translate to higher production rates in the petroleum industry. Against the background of the prevalence of higher viscous and imminent application of highly viscous liquids in the petroleum industry, air-water and air-low viscous liquid mixtures dominate gas void fraction research in vertical pipes. In this work, gas-liquid (μl=100−7000mPas) mixtures are used to investigate the behaviour of gas void fraction in vertical pipes. The influence of superficial phase velocities and liquid viscosity are observed. Further, a combined database consisting of experimental and the reported data of Schmidt et al. (2008) is employed to evaluate the predictions of 100 existing correlations. The results indicate that the Hibiki and Ishii (2003) and Bestion (1990) correlations are the overall best and second-best performing correlations. In the absence good performing correlations for churn and annular flows, two correlations each, based on drift flux and slip ratio, are developed respectively. Predictions from these correlations show good agreement with the database and comparable performance with the overall best correlations.
Joseph X.F. Ribeiro; Ruiquan Liao; Aliyu M. Aliyu; Yahaya D. Baba; Archibong Archibong-Eso; Adegboyega Ehinmowo; Liu Zilong. An assessment of gas void fraction prediction models in highly viscous liquid and gas two-phase vertical flows. Journal of Natural Gas Science and Engineering 2019, 76, 103107 .
AMA StyleJoseph X.F. Ribeiro, Ruiquan Liao, Aliyu M. Aliyu, Yahaya D. Baba, Archibong Archibong-Eso, Adegboyega Ehinmowo, Liu Zilong. An assessment of gas void fraction prediction models in highly viscous liquid and gas two-phase vertical flows. Journal of Natural Gas Science and Engineering. 2019; 76 ():103107.
Chicago/Turabian StyleJoseph X.F. Ribeiro; Ruiquan Liao; Aliyu M. Aliyu; Yahaya D. Baba; Archibong Archibong-Eso; Adegboyega Ehinmowo; Liu Zilong. 2019. "An assessment of gas void fraction prediction models in highly viscous liquid and gas two-phase vertical flows." Journal of Natural Gas Science and Engineering 76, no. : 103107.
Slug translational velocity, described as the velocity of slug units, is the summation of the maximum mixture velocity in the slug body and the drift velocity. Existing prediction models in literature were developed based on observation from low viscosity liquids, neglecting the effects of fluid properties (i.e., viscosity). However, slug translational velocity is expected to be affected by the fluid viscosity. Here, we investigate the influence of high liquid viscosity on slug translational velocity in a horizontal pipeline of 76.2-mm internal diameter. Air and mineral oil with viscosities within the range of 1.0–5.5 Pa·s were used in this investigation. Measurement was by means of a pair of gamma densitometer with fast sampling frequencies (up to 250 Hz). The results obtained show that slug translational velocity increases with increase in liquid viscosity. Existing slug translational velocity prediction models in literature were assessed based on the present high viscosity data for which statistical analysis revealed discrepancies. In view of this, a new empirical correlation for the calculation of slug translational velocity in highly viscous two-phase flow is proposed. A comparison study and validation of the new correlation showed an improved prediction performance.
Yahaya D. Baba; Archibong Archibong-Eso; Aliyu M. Aliyu; Joseph X. F. Ribeiro; Liyun Lao; Hoi Yeung. Slug Translational Velocity for Highly Viscous Oil and Gas Flows in Horizontal Pipes. Fluids 2019, 4, 170 .
AMA StyleYahaya D. Baba, Archibong Archibong-Eso, Aliyu M. Aliyu, Joseph X. F. Ribeiro, Liyun Lao, Hoi Yeung. Slug Translational Velocity for Highly Viscous Oil and Gas Flows in Horizontal Pipes. Fluids. 2019; 4 (3):170.
Chicago/Turabian StyleYahaya D. Baba; Archibong Archibong-Eso; Aliyu M. Aliyu; Joseph X. F. Ribeiro; Liyun Lao; Hoi Yeung. 2019. "Slug Translational Velocity for Highly Viscous Oil and Gas Flows in Horizontal Pipes." Fluids 4, no. 3: 170.
In this study, experiments were carried out in a vertical 60-mm internal diameter pipe with air and oil (viscosities 100–330 mPa s) constituting the gas and liquid phases. Superficial air and oil velocity ranges used were 9.81–59.06 m/s and 0.024–0.165 m/s, respectively. Visual observations and change in slope of pressure drop–Vsg plot were used to identify flow pattern transition to annular flow. Using the experimental data as well as other reported data, a new correlation to predict interfacial friction factor in upward gas–viscous liquid annular flow regime was developed. Compared to the performance of 16 existing correlations using higher viscosity liquids, that of the new correlation was better. The performance of another correlation we derived for predictions at both low and higher low viscous showed good agreement with measurements. In addition, a neural network model to predict the interfacial friction factor involving both low and high viscous liquids was developed and it excellently described the experimental data.
Joseph Xavier Francisco Ribeiro; Ruiquan Liao; Aliyu Aliyu; Zilong Liu. Upward interfacial friction factor in gas and high-viscosity liquid flows in vertical pipes. Chemical Engineering Communications 2019, 207, 1234 -1263.
AMA StyleJoseph Xavier Francisco Ribeiro, Ruiquan Liao, Aliyu Aliyu, Zilong Liu. Upward interfacial friction factor in gas and high-viscosity liquid flows in vertical pipes. Chemical Engineering Communications. 2019; 207 (9):1234-1263.
Chicago/Turabian StyleJoseph Xavier Francisco Ribeiro; Ruiquan Liao; Aliyu Aliyu; Zilong Liu. 2019. "Upward interfacial friction factor in gas and high-viscosity liquid flows in vertical pipes." Chemical Engineering Communications 207, no. 9: 1234-1263.
Slug translational velocity, described as the velocity of slug units, is the summation of the maximum mixture velocity in the slug body and the drift velocity. Accurate estimation of this parameter is important for energy-efficient design of oil and gas pipelines. A survey of the literature revealed that existing prediction models of this parameter were developed based on observation from low viscosity liquids (of 1 Pa.s or less). However, its behaviour in pipes transporting higher viscosity oils is significantly different. In this research work, new data for slug translational velocity in high-viscosity oil-gas flows are reported. Scaled experiments were carried out using a mixture of air and Mineral oil of viscosity ranging from 0.7 to 6.0 Pa.s in a 17-m long horizontal pipe of 0.0762 m ID. Temperature dependence of the oil's viscosity is given as μ=−0.0043T3+0.0389T2−1.4174T+18.141. The slug translational velocity was measured by means two pairs of two fast-sampling Gamma Densitometers with a sampling frequency of 250 Hz. For the range of experimental flow conditions investigated, increase in liquid oil viscosity was observed to strongly influence slug translational velocity. A new predictive correlation incorporating the effect of viscosity on slug translational velocity was derived using the current dataset and incorporating those obtained in literature with oil viscosity ranging from 0.189–6.0 Pa.s for horizontal flow. A comparison by statistical analysis and validation and of the new closure relationship showed a remarkably improved performance over existing correlations.
Yahaya D. Baba; Aliyu M. Aliyu; Nonso E. Okeke; Adamu S. Girei; Hoi Yeung. Evaluating the Effects of High Viscosity Liquid on Two Phase Flow Slug Translational Velocity using Gamma Radiation Methods. Day 2 Tue, August 06, 2019 2019, 1 .
AMA StyleYahaya D. Baba, Aliyu M. Aliyu, Nonso E. Okeke, Adamu S. Girei, Hoi Yeung. Evaluating the Effects of High Viscosity Liquid on Two Phase Flow Slug Translational Velocity using Gamma Radiation Methods. Day 2 Tue, August 06, 2019. 2019; ():1.
Chicago/Turabian StyleYahaya D. Baba; Aliyu M. Aliyu; Nonso E. Okeke; Adamu S. Girei; Hoi Yeung. 2019. "Evaluating the Effects of High Viscosity Liquid on Two Phase Flow Slug Translational Velocity using Gamma Radiation Methods." Day 2 Tue, August 06, 2019 , no. : 1.
Previous research work has shown that sand production with hydrocarbons has helped to increase the productivity of oil wells. However, this poses difficulties during shut down and start-up operations due to sand deposition and are aggravated when the pipelines are undulating. The hilly-terrain geometry of pipelines strongly affects multiphase flow regimes hence the need to study sand transport characteristics as it is vital in efficient pipeline design. The aim of this research work is to experimentally investigate the flow hydrodynamics that exist during sand transport in multiphase flow at different sand concentration. A 2-inch dip facility which consists of a downhill pipeline section, a lower elbow (dip) and an uphill pipeline at inclination angles of 24° is used in the study. Extensive data were collected and analysed from continuous measurement of instantaneous liquid and sand hold up using conductivity rings and flow visualisation using a high speed camera. Results show that five different flow patterns were obtained from the sand-water test both via visual observation and from the conductivity rings data namely: full suspension, streak, saltation, sand dunes and sand bed. The knowledge of flow at minimum transport condition and full suspension establishes the erosion rate over the life span of the pipeline. In contrast, the sand holdup measurement and sand dune regime which was uniquely identified using the conductivity ring method would help overcome the limitation of sand measurement in pipeline. Also, the Sand-Air-Water experiment carried out shows the influence of the pipe geometry and multiphase flow regimes on sand transport in multiphase transport pipelines.
Nonso E. Okeke; Osho Adeyem; Archibong Archibong-Eso; Yahaya D. Baba; Aliyu M. Aliyu; Emmanuel O. Aluyor; Hoi Yeung. Experimental Study on the Effect of Undulating Pipeline on Sand Transport in Multiphase Flow. Day 2 Tue, August 06, 2019 2019, 1 .
AMA StyleNonso E. Okeke, Osho Adeyem, Archibong Archibong-Eso, Yahaya D. Baba, Aliyu M. Aliyu, Emmanuel O. Aluyor, Hoi Yeung. Experimental Study on the Effect of Undulating Pipeline on Sand Transport in Multiphase Flow. Day 2 Tue, August 06, 2019. 2019; ():1.
Chicago/Turabian StyleNonso E. Okeke; Osho Adeyem; Archibong Archibong-Eso; Yahaya D. Baba; Aliyu M. Aliyu; Emmanuel O. Aluyor; Hoi Yeung. 2019. "Experimental Study on the Effect of Undulating Pipeline on Sand Transport in Multiphase Flow." Day 2 Tue, August 06, 2019 , no. : 1.
Producing sand during oil and gas production is unavoidable. Sand is produced along with oil and gas and its deposition in pipelines is a significant risk as it can cause pipe corrosion and flow assurance difficulties. It is therefore key that flow conditions are sustained to guarantee lack of deposition of sand particles. The minimum combination of mixture velocities that guarantee continuous sand motion is known as the minimum transport condition (MTC). Here, we investigate the effect both of sand concentration and particle diameter on MTC in a horizontal pipeline in the stratified flow regime. Non-intrusive conductivity probes were utilised for the detection of sand. These sensors are commonly used for the measurement of film thickness in gas and liquid flows, but we demonstrate their use here for sand detection after suitable calibration. It was observed that at the ultra-low sand concentrations of our experiments, MTC increases with both sand particle diameter and concentration. We developed a new correlation based on Thomas's lower model but included a sand concentration correction term that also applies at low particle concentrations. The correlation's predictions compared favourably with our measurements at MTC as well as data obtained from the open literature at medium concentrations.
Olawale T. Fajemidupe; Aliyu M. Aliyu; Yahaya D. Baba; Archibong E. Archibong; Nonso E. Okeke; Adegboyega B. Ehinmowo; Hoi Yeung. Minimum Sand Transport Conditions in Gas-Solid-Liquid Three-Phase Stratified Flow in Horizontal Pipelines. Day 2 Tue, August 06, 2019 2019, 1 .
AMA StyleOlawale T. Fajemidupe, Aliyu M. Aliyu, Yahaya D. Baba, Archibong E. Archibong, Nonso E. Okeke, Adegboyega B. Ehinmowo, Hoi Yeung. Minimum Sand Transport Conditions in Gas-Solid-Liquid Three-Phase Stratified Flow in Horizontal Pipelines. Day 2 Tue, August 06, 2019. 2019; ():1.
Chicago/Turabian StyleOlawale T. Fajemidupe; Aliyu M. Aliyu; Yahaya D. Baba; Archibong E. Archibong; Nonso E. Okeke; Adegboyega B. Ehinmowo; Hoi Yeung. 2019. "Minimum Sand Transport Conditions in Gas-Solid-Liquid Three-Phase Stratified Flow in Horizontal Pipelines." Day 2 Tue, August 06, 2019 , no. : 1.
This paper presents steady-state simulation and exergy analysis of the 2-amino-2-methyl-1-propanol (AMP)-based post-combustion capture (PCC) plant. Exergy analysis provides the identification of the location, sources of thermodynamic inefficiencies, and magnitude in a thermal system. Furthermore, thermodynamic analysis of different configurations of the process helps to identify opportunities for reducing the steam requirements for each of the configurations. Exergy analysis performed for the AMP-based plant and the different configurations revealed that the rich split with intercooling configuration gave the highest exergy efficiency of 73.6%, while that of the intercooling and the reference AMP-based plant were 57.3% and 55.8% respectively. Thus, exergy analysis of flowsheeting configurations can lead to significant improvements in plant performance and lead to cost reduction for amine-based CO2 capture technologies.
Ebuwa Osagie; Aliyu M. Aliyu; Somtochukwu Godfrey Nnabuife; Osaze Omoregbe; Victor Etim; Aliyu Aliyu. Exergy Analysis and Evaluation of the Different Flowsheeting Configurations for CO2 Capture Plant Using 2-Amino-2-Methyl-1-Propanol (AMP). Processes 2019, 7, 391 .
AMA StyleEbuwa Osagie, Aliyu M. Aliyu, Somtochukwu Godfrey Nnabuife, Osaze Omoregbe, Victor Etim, Aliyu Aliyu. Exergy Analysis and Evaluation of the Different Flowsheeting Configurations for CO2 Capture Plant Using 2-Amino-2-Methyl-1-Propanol (AMP). Processes. 2019; 7 (6):391.
Chicago/Turabian StyleEbuwa Osagie; Aliyu M. Aliyu; Somtochukwu Godfrey Nnabuife; Osaze Omoregbe; Victor Etim; Aliyu Aliyu. 2019. "Exergy Analysis and Evaluation of the Different Flowsheeting Configurations for CO2 Capture Plant Using 2-Amino-2-Methyl-1-Propanol (AMP)." Processes 7, no. 6: 391.
An experimental study is conducted using a 0.075-m ID pipe to investigate characteristics of two- and three-phase stratified flow in a horizontal pipeline. Experiments are conducted under low to medium liquid loading conditions which is common in wet-gas and long transportation pipelines. The flow characteristics investigated include flow pattern, liquid holdup and pressure drop. The experimental range covers superficial gas Reynolds numbers from 6314 to 200,734, superficial liquid Reynolds numbers from 160 to 4391 and water-cut values from 0 to 90%. Differential pressure transducers, quick closing valves and a high-speed camera are utilized to obtain the relevant data and the trends investigated. The observed flow patterns are stratified smooth, stratified wavy and stratified-annular flow. The transitions between flow patterns vary as a function of water-cut. The effect of water-cut on liquid holdup and pressure drop were relatively negligible especially at low water-cut conditions and the fine mixing of the oil-water mixture may be partially responsible for this. As a result, with the exception of flow pattern transitions, the performances of classical two-phase flow models (for the prediction of liquid holdup and pressure drop) appear unaffected when applied to air–oil–water 3-phase flows especially at high water-cuts.
Joseph Xavier Francisco Ribeiro; Ruiquan Liao; Aliyu Musa Aliyu; Wei Luo; Zilong Liu; Aliyu Aliyu. Experimental study of horizontal two- and three-phase flow characteristics at low to medium liquid loading conditions. Heat and Mass Transfer 2019, 55, 2809 -2830.
AMA StyleJoseph Xavier Francisco Ribeiro, Ruiquan Liao, Aliyu Musa Aliyu, Wei Luo, Zilong Liu, Aliyu Aliyu. Experimental study of horizontal two- and three-phase flow characteristics at low to medium liquid loading conditions. Heat and Mass Transfer. 2019; 55 (10):2809-2830.
Chicago/Turabian StyleJoseph Xavier Francisco Ribeiro; Ruiquan Liao; Aliyu Musa Aliyu; Wei Luo; Zilong Liu; Aliyu Aliyu. 2019. "Experimental study of horizontal two- and three-phase flow characteristics at low to medium liquid loading conditions." Heat and Mass Transfer 55, no. 10: 2809-2830.
Sand production in the life of oil and gas reservoirs is inevitable, as it is co-produced with oil and gas from reservoirs. Its deposition in petroleum pipelines poses considerable risk to production and can lead to pipe corrosion and flow assurance challenges. Therefore, it is important that pipe flow conditions are maintained to ensure sand particles are not deposited but in continuous motion with the flow. The combination of minimum gas and liquid velocities that ensure continuous sand motion is known as the minimum transport condition (MTC). This study investigates the effect both of sand particle diameter and concentration on MTC in gas/liquid stratified flow in a horizontal pipeline. We used non-intrusive conductivity sensors for sand detection. These sensors, used for film thickness measurement in gas/liquid flows, was used here for sand detection. We found that MTC increases with increase in particle diameter for the same concentration and also increases as the concentration increases for the same particle diameter. A correlation is proposed for the prediction of sand transport at MTC in air–water flows in horizontal pipes, by including the effect of sand concentration in Thomas’s lower model. The correlation accounts for low sand concentrations and gave excellent predictions when compared with the experimental results at MTC.
Olawale T. Fajemidupe; Aliyu M. Aliyu; Yahaya D. Baba; Archibong Archibong-Eso; Hoi Yeung; Aliyu Aliyu. Sand minimum transport conditions in gas–solid–liquid three-phase stratified flow in a horizontal pipe at low particle concentrations. Chemical Engineering Research and Design 2019, 143, 114 -126.
AMA StyleOlawale T. Fajemidupe, Aliyu M. Aliyu, Yahaya D. Baba, Archibong Archibong-Eso, Hoi Yeung, Aliyu Aliyu. Sand minimum transport conditions in gas–solid–liquid three-phase stratified flow in a horizontal pipe at low particle concentrations. Chemical Engineering Research and Design. 2019; 143 ():114-126.
Chicago/Turabian StyleOlawale T. Fajemidupe; Aliyu M. Aliyu; Yahaya D. Baba; Archibong Archibong-Eso; Hoi Yeung; Aliyu Aliyu. 2019. "Sand minimum transport conditions in gas–solid–liquid three-phase stratified flow in a horizontal pipe at low particle concentrations." Chemical Engineering Research and Design 143, no. : 114-126.