This page has only limited features, please log in for full access.
Geothermal energy is a reliable and mature energy source, but it represents less than 1% of the total renewable energy mix. While the enhanced geothermal system (EGS) concept faces technical validation challenges and suffers from public acceptance issues, the development of unconventional deep-well designs can help to improve their efficiency and reliability. Modelling single-EGS-well designs is key to assessing their long-term thermal performances, particularly in unconventional geological settings. Numerical results obtained with the T2WELL/EOS1 code have been validated with available experimental data from a deep borehole heat exchanger (DBHE), where a temperature of 358
Theo Renaud; Lehua Pan; Hannah Doran; Gioia Falcone; Patrick Verdin. Numerical Analysis of Enhanced Conductive Deep Borehole Heat Exchangers. Sustainability 2021, 13, 6918 .
AMA StyleTheo Renaud, Lehua Pan, Hannah Doran, Gioia Falcone, Patrick Verdin. Numerical Analysis of Enhanced Conductive Deep Borehole Heat Exchangers. Sustainability. 2021; 13 (12):6918.
Chicago/Turabian StyleTheo Renaud; Lehua Pan; Hannah Doran; Gioia Falcone; Patrick Verdin. 2021. "Numerical Analysis of Enhanced Conductive Deep Borehole Heat Exchangers." Sustainability 13, no. 12: 6918.
Geothermal energy aims at producing electricity or heat from underground resources. Worldwide geothermal energy extraction and use is still limited, despite its estimated high potential. To date, the efficiency and viability of enhanced geothermal system (EGS) and deep unconventional geothermal resources (e.g. superheated/supercritical systems) via conventional heat recovery techniques have led to limited success due to technology issues. Research on superheated/supercritical geothermal systems is highly active in Europe, notably triggered by the Iceland Deep Drilling Project (IDDP) [1]. Supercritical resources could deliver more energy than conventional resources thanks to the increase of enthalpy and the sharp decrease of density around the critical point of water [2]. The first well from IDDP was drilled at a depth of 2072 m after unintentionally drilling into magma between 2092 and 2104 m. The wellhead temperature reached 450°CC, with a superheated steam at a pressure of 140 bars (Palsson et al. in Geothermics 49:23–30, 2014).
Theo Renaud; Patrick Verdin; Gioia Falcone. Heat Transfer in Unconventional Geothermal Wells: A Double Numerical Modelling Approach. Advances in Heat Transfer and Thermal Engineering 2021, 791 -795.
AMA StyleTheo Renaud, Patrick Verdin, Gioia Falcone. Heat Transfer in Unconventional Geothermal Wells: A Double Numerical Modelling Approach. Advances in Heat Transfer and Thermal Engineering. 2021; ():791-795.
Chicago/Turabian StyleTheo Renaud; Patrick Verdin; Gioia Falcone. 2021. "Heat Transfer in Unconventional Geothermal Wells: A Double Numerical Modelling Approach." Advances in Heat Transfer and Thermal Engineering , no. : 791-795.
In recent years, Computational Fluid Dynamics (CFD) modelling methods have been applied to study the behavior of a single elongated bubble in stagnant and flowing liquid. To date, only very few studies have been performed for slightly upwardly inclined pipes. This work presents mostly 2D numerical simulations based on the Volume of Fluid approach, dealing with the characteristics of a single elongated bubble injected into a liquid in a slightly upwardly inclined pipe. CFD-based results were compared with experimental results. In general, except the numerical bubble length, drift velocity, bubble fraction and bubble shape, agreed fairly with the experimental outcomes.
Aniefiok Livinus; Patrick G. Verdin. CFD study of the characteristics of a single elongated gas bubble in liquid in a moderately inclined pipe. Upstream Oil and Gas Technology 2021, 7, 100037 .
AMA StyleAniefiok Livinus, Patrick G. Verdin. CFD study of the characteristics of a single elongated gas bubble in liquid in a moderately inclined pipe. Upstream Oil and Gas Technology. 2021; 7 ():100037.
Chicago/Turabian StyleAniefiok Livinus; Patrick G. Verdin. 2021. "CFD study of the characteristics of a single elongated gas bubble in liquid in a moderately inclined pipe." Upstream Oil and Gas Technology 7, no. : 100037.
Geothermal is a renewable energy source that can be untapped through various subsurface technologies. Closed geothermal well solutions, such as deep geothermal heat exchangers (DBHEs), consist of circulating a working fluid to recover the available heat, with less dependency on the local geological settings than conventional geothermal systems. This paper emphasizes a double numerical method to strengthen the assessment of DBHE performances. A computational fluid dynamics (CFD) commercial software and the 1D coupled wellbore-reservoir geothermal simulator T2Well have been used to investigate the heat transfer and fluid flow in a vertical DBHE in high geothermal gradient environments. The use of constant water properties to investigate the energy produced from DBHEs can lead to underestimating the overall heat transfer at high temperature and low mass flow rate. 2D axisymmetric CFD modelling improves the understanding of the return flow at the bottom of the DBHE, readjusting and better estimating the pressures losses commonly obtained with 1D modelling. This paper highlights the existence of convective cells located at the bottom of the DBHE internal tubing, with no significant effects due to the increase of injected water flow. Both codes are shown to constrain the numerical limitations to access the true potential of geothermal heat extraction from DBHEs in high geothermal gradient environments and demonstrate that they can be used for geothermal energy engineering applications.
Theo Renaud; Patrick G. Verdin; Gioia Falcone. Conjugated Numerical Approach for Modelling DBHE in High Geothermal Gradient Environments. Energies 2020, 13, 6107 .
AMA StyleTheo Renaud, Patrick G. Verdin, Gioia Falcone. Conjugated Numerical Approach for Modelling DBHE in High Geothermal Gradient Environments. Energies. 2020; 13 (22):6107.
Chicago/Turabian StyleTheo Renaud; Patrick G. Verdin; Gioia Falcone. 2020. "Conjugated Numerical Approach for Modelling DBHE in High Geothermal Gradient Environments." Energies 13, no. 22: 6107.
Two phase flow is of great interest in chemical and petroleum industries, and multiphase pipe flow models with closure relationships require experimental data for their development and validation. However, only little experimental information is available for slightly upward inclined pipes. Experimental investigations of single elongated bubble in marginally upwardly inclined pipes less than 10° have therefore been performed. Observations of the bubble drift velocity along the pipe has been highlighted. The drift velocity data presented here can contribute to improve knowledge of pipe inclination and viscosity dependency in drift velocity correlations. The new data on the bubble characteristics - shape, length, fraction and drift velocity may also provide useful information for the development and validation of numerical models. The measured drift velocity data have therefore been compared with some recently developed bubble velocity correlations.
Aniefiok Livinus; Patrick G. Verdin. Experimental study of a single elongated bubble in liquid in under 10-degree upwardly inclined pipes. Experimental Thermal and Fluid Science 2020, 120, 110247 .
AMA StyleAniefiok Livinus, Patrick G. Verdin. Experimental study of a single elongated bubble in liquid in under 10-degree upwardly inclined pipes. Experimental Thermal and Fluid Science. 2020; 120 ():110247.
Chicago/Turabian StyleAniefiok Livinus; Patrick G. Verdin. 2020. "Experimental study of a single elongated bubble in liquid in under 10-degree upwardly inclined pipes." Experimental Thermal and Fluid Science 120, no. : 110247.
Operating forces and magnitude of loads from gas-liquid slug flows exerted on a horizontally orientated 90o bend are investigated. The distributed forces are either Newtonian, associated with the fluids motion or Configurational, inherent to the internal distributions of the phases. The forces are derived through the conventional balances of mass and linear momentum arising from the volume of fluid (VOF) description of gas-liquid flows. The study uses the integral form of the momentum balance to estimate the operating forces budget. Invoking dynamical time scales separation discloses the connection of the Lamb vector (vortex-force) to the local time rate of momentum. An interesting outcome being an explicit expression for Favre-Reynolds stress that reveals the contribution of void fraction fluctuations in the redistribution of the stress across the interface. Numerical simulations are performed to determine the magnitude of Newtonian loads on bend using a segmented domain technique to represent the fully established slug flow regime. The time-dependent traces of the relevant flow variables such as liquid hold-up, flow rates and resultant forces on the bend are recorded and analysed. Compared to the isotropic component, the deviatoric stresses are shown to have a marginal contribution to the total forces. It is also shown that loading cycles on bends are much higher than slugging cycles; this is an important feature for the structural integrity assessment of pipelines with bends.
Mustapha Gourma; Patrick Verdin. Nature and magnitude of operating forces in a horizontal bend conveying gas-liquid slug flows. Journal of Petroleum Science and Engineering 2020, 190, 107062 .
AMA StyleMustapha Gourma, Patrick Verdin. Nature and magnitude of operating forces in a horizontal bend conveying gas-liquid slug flows. Journal of Petroleum Science and Engineering. 2020; 190 ():107062.
Chicago/Turabian StyleMustapha Gourma; Patrick Verdin. 2020. "Nature and magnitude of operating forces in a horizontal bend conveying gas-liquid slug flows." Journal of Petroleum Science and Engineering 190, no. : 107062.
A comparative study of four well established surrogate models used to predict the non-linear entrainment performance of a dual-phase fluid driving jet pump (JP) apparatus is performed. A JP design flow configuration comprising a dual-phase (air and water) flow driving a secondary gas-air flow, for which no one has ever provided a unique set of design solutions, is described. For the construction of the global approximations (GA), the response surface methodology (RSM), Kriging and the radial basis function artificial neural network (RBFANN), were primarily used. The stacked/ensemble models methodology was integrated in this study, to improve the predictive model results, thus providing accurate GA that facilitate the multi-variable non-linear response design optimisation. An error analysis of all four models along with a multiple model accuracy analysis of each case study were performed. The RSM, Kriging, RBFANN and stacked models formed part of the surrogate-based optimisation, having the entrainment ratio as the main objective function. Optimisation problems were solved by the interior-point algorithm and the genetic algorithm and incurred a hybrid formulation of both algorithms. A total of 60 optimisation problems were formulated and solved with all three approximation models. Results showed that the hybrid formulation having the level-2 ensemble Kriging model performed best, predicting the experimental performance results for all JP models within an error margin of less than 10 % in 90 % of the cases.
D. Mifsud; Patrick Verdin. Surrogate-Based Design Optimisation Tool for Dual-Phase Fluid Driving Jet Pump Apparatus. Archives of Computational Methods in Engineering 2019, 28, 53 -89.
AMA StyleD. Mifsud, Patrick Verdin. Surrogate-Based Design Optimisation Tool for Dual-Phase Fluid Driving Jet Pump Apparatus. Archives of Computational Methods in Engineering. 2019; 28 (1):53-89.
Chicago/Turabian StyleD. Mifsud; Patrick Verdin. 2019. "Surrogate-Based Design Optimisation Tool for Dual-Phase Fluid Driving Jet Pump Apparatus." Archives of Computational Methods in Engineering 28, no. 1: 53-89.
Theo Renaud; Patrick Verdin; Gioia Falcone. Numerical simulation of a Deep Borehole Heat Exchanger in the Krafla geothermal system. International Journal of Heat and Mass Transfer 2019, 143, 1 .
AMA StyleTheo Renaud, Patrick Verdin, Gioia Falcone. Numerical simulation of a Deep Borehole Heat Exchanger in the Krafla geothermal system. International Journal of Heat and Mass Transfer. 2019; 143 ():1.
Chicago/Turabian StyleTheo Renaud; Patrick Verdin; Gioia Falcone. 2019. "Numerical simulation of a Deep Borehole Heat Exchanger in the Krafla geothermal system." International Journal of Heat and Mass Transfer 143, no. : 1.
The recent development of additive manufacturing has allowed complex geometries such as multi-layered lattice structures to be designed for different applications, including heat transfer. Performing Computational Fluid Dynamics (CFD) analyses on each new design iteration of lattice structures would require high computational time and cost. An analytical model has therefore been developed, able to rapidly and cost-effectively predict the heat transfer of complex lattice structures. The numerical code has been written for a given multi-layered lattice sample and a two-step approach with fin analogy has been applied to determine the mean outlet fluid temperature and the total heat dissipation for air as the working fluid. CFD simulations have also been performed and results compared to the analytical ones. A very good agreement is obtained between numerical and analytical results under the defined industrial operating conditions of the complex lattice structures, showing that such analytical model can be quickly and efficiently applied to evaluate the thermal performance of multi-layered lattice structures.
Jean Ernot; Patrick G. Verdin; Hayder Ahmad; Philip Indge. Analytical and numerical predictions of the thermal performance of multi-layered lattice structures. International Journal of Heat and Mass Transfer 2019, 145, 118752 .
AMA StyleJean Ernot, Patrick G. Verdin, Hayder Ahmad, Philip Indge. Analytical and numerical predictions of the thermal performance of multi-layered lattice structures. International Journal of Heat and Mass Transfer. 2019; 145 ():118752.
Chicago/Turabian StyleJean Ernot; Patrick G. Verdin; Hayder Ahmad; Philip Indge. 2019. "Analytical and numerical predictions of the thermal performance of multi-layered lattice structures." International Journal of Heat and Mass Transfer 145, no. : 118752.
The hydrodynamic behavior of a turbulent flow and the mixing characteristics generated by a V-grooved axial impeller inside an agitated tank reactor were investigated both experimentally and numerically. Angle resolved Particle Image Velocimetry (PIV) techniques with an angular displacement Δθ=5° have been applied and two aerodynamic planes along the blades were considered. PIV-based results were compared to those obtained by Large Eddy Simulation (LES), used with the dynamic Smagorinsky-Lilly sub-grid scale (SGS) model. Results showed the existence of distinctive recirculation zones in the aerodynamic planes, and new additional frequencies in the impeller stream, induced by the grooves. A decrease of mixing time of about 11 % was obtained experimentally, consequence of the better suction induced by the grooved blades in the early stages of mixing. Mean velocities, vorticity, TKE obtained from LES showed a good agreement with the PIV-based results. The distributions of turbulence dissipation rate ε were similar to those obtained from PIV, however showing high under-predicted magnitudes.
Israel González-Neria; Alejandro Alonzo-Garcia; Sergio A. Martínez-Delgadillo; Víctor X. Mendoza-Escamilla; Juan Antonio Yáñez-Varela; Patrick G. Verdin; Gabriela Rivadeneyra-Romero. PIV and dynamic LES of the turbulent stream and mixing induced by a V-grooved blade axial agitator. Chemical Engineering Journal 2019, 374, 1138 -1152.
AMA StyleIsrael González-Neria, Alejandro Alonzo-Garcia, Sergio A. Martínez-Delgadillo, Víctor X. Mendoza-Escamilla, Juan Antonio Yáñez-Varela, Patrick G. Verdin, Gabriela Rivadeneyra-Romero. PIV and dynamic LES of the turbulent stream and mixing induced by a V-grooved blade axial agitator. Chemical Engineering Journal. 2019; 374 ():1138-1152.
Chicago/Turabian StyleIsrael González-Neria; Alejandro Alonzo-Garcia; Sergio A. Martínez-Delgadillo; Víctor X. Mendoza-Escamilla; Juan Antonio Yáñez-Varela; Patrick G. Verdin; Gabriela Rivadeneyra-Romero. 2019. "PIV and dynamic LES of the turbulent stream and mixing induced by a V-grooved blade axial agitator." Chemical Engineering Journal 374, no. : 1138-1152.
The characteristics of two-phase flow through a `conventional’ convergent-nozzle in an entrainment chamber of an ejector apparatus are described in this paper. A unique data set comprising 350 data points was generated in an air-water horizontal test-rig. Two sets of flow conditions were established, the first one including high liquid - low gas fluids with void fractions less than 0.55, and the second one involving high gas - low liquid fluids with void fractions greater than 0.75. All considered flow-rates lied within the sub-critical flow region. Two-phase flow pressure drop multiplier based empirical correlations were developed to estimate the total mass flow-rates. In the high liquid region, Morris (1985) correlation was modified, resulting in less than 10 % error. In the high gas region, two new correlations were proposed, showing less than 10 % and 15 % of errors, respectively. The established empirical correlations were related to other available multipliers for different geometric configurations including a Venturi, an orifice plate, a gate valve, and a globe valve and were compared to 20 other void fraction correlations. The Chisholm (1983b) and Huq and Loth (1992) correlations showed the highest similarities to the ones proposed for the high liquid and high gas regions, respectively.
D. Mifsud; Y. Cao; P.G. Verdin; L. Lao. The hydrodynamics of two-phase flows in the injection part of a conventional ejector. International Journal of Multiphase Flow 2018, 112, 219 -242.
AMA StyleD. Mifsud, Y. Cao, P.G. Verdin, L. Lao. The hydrodynamics of two-phase flows in the injection part of a conventional ejector. International Journal of Multiphase Flow. 2018; 112 ():219-242.
Chicago/Turabian StyleD. Mifsud; Y. Cao; P.G. Verdin; L. Lao. 2018. "The hydrodynamics of two-phase flows in the injection part of a conventional ejector." International Journal of Multiphase Flow 112, no. : 219-242.
X.F. Loyseau; Patrick Verdin; L.D. Brown. Scale-up and turbulence modelling in pipes. Journal of Petroleum Science and Engineering 2018, 162, 1 -11.
AMA StyleX.F. Loyseau, Patrick Verdin, L.D. Brown. Scale-up and turbulence modelling in pipes. Journal of Petroleum Science and Engineering. 2018; 162 ():1-11.
Chicago/Turabian StyleX.F. Loyseau; Patrick Verdin; L.D. Brown. 2018. "Scale-up and turbulence modelling in pipes." Journal of Petroleum Science and Engineering 162, no. : 1-11.
The present paper covers the comparison of two different configurations (square and circular) pinfin heat sinks embedded with two different phase change materials (PCMs) namely paraffin wax and n-eicosane having different thermo-physical properties were carried out for passive cooling of electronic devices. The pin-fins, acting as thermal conductivity enhancers (TCEs), of
Hafiz Muhammad Ali; Adeel Arshad; Mark Jabbal; Patrick Verdin. Thermal management of electronics devices with PCMs filled pin-fin heat sinks: A comparison. International Journal of Heat and Mass Transfer 2018, 117, 1199 -1204.
AMA StyleHafiz Muhammad Ali, Adeel Arshad, Mark Jabbal, Patrick Verdin. Thermal management of electronics devices with PCMs filled pin-fin heat sinks: A comparison. International Journal of Heat and Mass Transfer. 2018; 117 ():1199-1204.
Chicago/Turabian StyleHafiz Muhammad Ali; Adeel Arshad; Mark Jabbal; Patrick Verdin. 2018. "Thermal management of electronics devices with PCMs filled pin-fin heat sinks: A comparison." International Journal of Heat and Mass Transfer 117, no. : 1199-1204.
Aniefiok Livinus; Patrick Verdin; Liyun Lao; Jan Nossen; Morten Langsholt; Hans-Gunnar Sleipnæs. Simplified generalised drift velocity correlation for elongated bubbles in liquid in pipes. Journal of Petroleum Science and Engineering 2018, 160, 106 -118.
AMA StyleAniefiok Livinus, Patrick Verdin, Liyun Lao, Jan Nossen, Morten Langsholt, Hans-Gunnar Sleipnæs. Simplified generalised drift velocity correlation for elongated bubbles in liquid in pipes. Journal of Petroleum Science and Engineering. 2018; 160 ():106-118.
Chicago/Turabian StyleAniefiok Livinus; Patrick Verdin; Liyun Lao; Jan Nossen; Morten Langsholt; Hans-Gunnar Sleipnæs. 2018. "Simplified generalised drift velocity correlation for elongated bubbles in liquid in pipes." Journal of Petroleum Science and Engineering 160, no. : 106-118.
Air-water numerical simulations in the slug flow regime have been performed in horizontal helical pipes and the effects of geometries on the flow regime have been investigated. Depending on the length of the helix, outlet slug frequencies have been reduced with various degrees of efficiency. Correlations between mean tangential velocity and helicity density fluctuations have been identified and investigated qualitatively. These flow fields show smaller time scales than those obtained in volume fractions fluctuations. Shifts observed in the tangential velocity and mean helicity fluctuations to smaller time scales (high frequencies) are associated with regime transitions. For a slug flow undergoing a continuous transition to the annular flow regime, it is shown that the presence of slower (low frequencies) helicity fluctuations is attributed to the variations in the axial velocity. Finally, the analysis of the helicity at gas-liquid interface confirms the presence of the mixing zone at the slug front.
M. Gourma; P.G. Verdin. Two-phase slug flows in helical pipes: Slug frequency alterations and helicity fluctuations. International Journal of Multiphase Flow 2016, 86, 10 -20.
AMA StyleM. Gourma, P.G. Verdin. Two-phase slug flows in helical pipes: Slug frequency alterations and helicity fluctuations. International Journal of Multiphase Flow. 2016; 86 ():10-20.
Chicago/Turabian StyleM. Gourma; P.G. Verdin. 2016. "Two-phase slug flows in helical pipes: Slug frequency alterations and helicity fluctuations." International Journal of Multiphase Flow 86, no. : 10-20.
Water droplets in vertical pipes have been investigated to assert the accuracy of a newly developed Lagrangian model for dispersion and deposition implemented in the Open source CFD code OpenFOAM. The transient evolution of the particles dispersion and concentration has been studied for the combined effects of Brownian motion and turbulent dispersion. A parametric study of mesh density has been performed and the influence of the isotropic representation of turbulence discussed. Simulated results have been compared to experimental data from the literature and to results generated with a commercial flow solver. A new model has also been developed to predict the evolution of the droplet concentration and deposition in pipes, based on a statistical description of the dispersion.
X.F. Loyseau; P.G. Verdin. Statistical model of transient particle dispersion and deposition in vertical pipes. Journal of Aerosol Science 2016, 101, 43 -64.
AMA StyleX.F. Loyseau, P.G. Verdin. Statistical model of transient particle dispersion and deposition in vertical pipes. Journal of Aerosol Science. 2016; 101 ():43-64.
Chicago/Turabian StyleX.F. Loyseau; P.G. Verdin. 2016. "Statistical model of transient particle dispersion and deposition in vertical pipes." Journal of Aerosol Science 101, no. : 43-64.
A population balance model using a standard method of moments (S−γ) in an Eulerian–Eulerian framework has been used for oil and brine two-phase flow simulations in pipelines. Results have been compared to both numerical and experimental data from the literature. The effects of the forces constituting the momentum transfer term at the interphase between droplets and the continuous phase (drag, lift, turbulent dispersion and virtual mass), turbulence modelling, break-up and coalescence parameters are analysed; they are shown to be important for droplet mean diameter evolution. It has been demonstrated that a correct combination of models and parameters improves (47% for the best case) simulated results when compared to experimental data. Interactions between the different components of the whole model are discussed and their corresponding effects on the droplet diameter predictions are explained. In particular, the addition of the lift force tends to push the droplet toward the walls of the computational domain where turbulence and shear stress are the strongest, therefore leading to an increased break-up rate. Based on the findings of this study, recommendations for further population balance-based modelling with a standard method of moments are provided.
A.C. Bourdillon; P.G. Verdin; C.P. Thompson. Numerical simulations of drop size evolution in a horizontal pipeline. International Journal of Multiphase Flow 2015, 78, 44 -58.
AMA StyleA.C. Bourdillon, P.G. Verdin, C.P. Thompson. Numerical simulations of drop size evolution in a horizontal pipeline. International Journal of Multiphase Flow. 2015; 78 ():44-58.
Chicago/Turabian StyleA.C. Bourdillon; P.G. Verdin; C.P. Thompson. 2015. "Numerical simulations of drop size evolution in a horizontal pipeline." International Journal of Multiphase Flow 78, no. : 44-58.
Convection and enthalpy-porosity based solidification solvers have been implemented in the Open source CFD code OpenFOAM to study water freezing phenomena in internal geometries. A polynomial water density variation has been used for the gravity related terms. Liquid to solid phase changes have been accounted for in both energy and momentum equations and the water volume fraction has been modelled with a temperature function in the domain. The models described in this paper have been compared with numerical results obtained with commercial or in-house CFD codes for a squared shape cavity and inside a cylindrical enclosure. When possible, results have also been compared to experimental measurements. This solidification solver has finally been extended and modified to create a novel formulation to account for slurry and mushy regions. It appeared clearly that physical phenomena observed in experiments could be reproduced with high accuracy when using either the solidification solver or the new slurry–mushy solidification solver. For the latter model, a distinction is made between the newly formed ice particles not interacting with each other (slurry region) and the mixture of compact ice and liquid (mushy region). The correct modelling of these two distinct regions is necessary for hydro-carbon industries for instance, where cooling oil can form wax gels.
A.C. Bourdillon; P.G. Verdin; C.P. Thompson. Numerical simulations of water freezing processes in cavities and cylindrical enclosures. Applied Thermal Engineering 2014, 75, 839 -855.
AMA StyleA.C. Bourdillon, P.G. Verdin, C.P. Thompson. Numerical simulations of water freezing processes in cavities and cylindrical enclosures. Applied Thermal Engineering. 2014; 75 ():839-855.
Chicago/Turabian StyleA.C. Bourdillon; P.G. Verdin; C.P. Thompson. 2014. "Numerical simulations of water freezing processes in cavities and cylindrical enclosures." Applied Thermal Engineering 75, no. : 839-855.
A CFD model of stratified flow with atomization has been developed to study the transport of water droplets in gas–liquid multiphase systems in 38 in. diameter pipes. Entrained droplets may deposit onto the wall surface, forming a thin draining film associated with an effective interfacial roughness. Secondary flows related to large gas flow rates may enhance the transport of droplets in the top region of the pipe. Gas–liquid surface tension also appears as an important parameter; it is shown to affect the entrainment rate and subsequently, the droplet deposition rate. This work involving water droplets extends the initial study performed with oil droplets entrainment in the gas phase, validated for 8 in. pipes, and scaled-up on larger diameter pipes.
P.G. Verdin; C.P. Thompson; L.D. Brown. CFD modelling of stratified/atomization gas–liquid flow in large diameter pipes. International Journal of Multiphase Flow 2014, 67, 135 -143.
AMA StyleP.G. Verdin, C.P. Thompson, L.D. Brown. CFD modelling of stratified/atomization gas–liquid flow in large diameter pipes. International Journal of Multiphase Flow. 2014; 67 ():135-143.
Chicago/Turabian StyleP.G. Verdin; C.P. Thompson; L.D. Brown. 2014. "CFD modelling of stratified/atomization gas–liquid flow in large diameter pipes." International Journal of Multiphase Flow 67, no. : 135-143.
Predicted ice shapes obtained with a fully automated multi-stepping procedure implemented in the ice prediction code ICECREMO2 are discussed in this paper. Several multi-step algorithms are used to generate ice layers on cylinders in rime and glaze ice conditions. Although all multi-step algorithms produce acceptable rime ice results, a multi-step approach based on an ice height criterion appears as the most efficient method for glaze ice predictions. The outcome is compared with results obtained for a NACA0012 airfoil geometry. The influence of the un-iced substrate shape is investigated, general restart criteria for multi-step height-based icing codes are presented and discussed.
Patrick Verdin; Jean P. F. Charpin. Multi-Stepping Ice Prediction on Cylinders and Other Relevant Geometries. Journal of Aircraft 2013, 50, 871 -878.
AMA StylePatrick Verdin, Jean P. F. Charpin. Multi-Stepping Ice Prediction on Cylinders and Other Relevant Geometries. Journal of Aircraft. 2013; 50 (3):871-878.
Chicago/Turabian StylePatrick Verdin; Jean P. F. Charpin. 2013. "Multi-Stepping Ice Prediction on Cylinders and Other Relevant Geometries." Journal of Aircraft 50, no. 3: 871-878.