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In this paper, the turbulent flow of a nanofluid in a channel is simulated in the presence of a pin-fin heatsink. Pin fins have different shapes, including hexagonal, circular, square, and triangular that are considered in two different arrangements. Constant heat flux is applied to the heatsink from its bottom due to the operation of an electronic chip. The nanoparticles suspended in water are alumina, which are in different shapes such as blades, bricks, cylinders, and plates. Their shape effect is investigated. The nanofluid enters the channel at a constant velocity in the range of 1–3 m/s and a constant volume percentage of 2%, and exits after cooling the pin-fin heatsink. The standard k-ε turbulence model is used to model turbulent flow, and the SIMPLEC method is employed to linearize the equations. The variables include fin type, fin arrangement, nanoparticle shape, and nanofluid velocity. Their effect on the maximum and average heatsink temperature and pressure drop (ΔP) is studied. The results show that increasing the velocity leads to a reduction in heatsink temperature, and the use of brick-shaped nanoparticles and circular fin results in the best cooling performance. Also, the use of circular fin and brick nanoparticles requires less ΔP than other cases.
Yacine Khetib; Khaled Sedraoui; Ammar A. Melaibari; Ali Alzaied; Radi Alsulami; Mohsen Sharifpur. Heat transfer and pressure drop in turbulent nanofluid flow in a pin-fin heat sink: Fin and nanoparticles shape effects. Case Studies in Thermal Engineering 2021, 28, 101378 .
AMA StyleYacine Khetib, Khaled Sedraoui, Ammar A. Melaibari, Ali Alzaied, Radi Alsulami, Mohsen Sharifpur. Heat transfer and pressure drop in turbulent nanofluid flow in a pin-fin heat sink: Fin and nanoparticles shape effects. Case Studies in Thermal Engineering. 2021; 28 ():101378.
Chicago/Turabian StyleYacine Khetib; Khaled Sedraoui; Ammar A. Melaibari; Ali Alzaied; Radi Alsulami; Mohsen Sharifpur. 2021. "Heat transfer and pressure drop in turbulent nanofluid flow in a pin-fin heat sink: Fin and nanoparticles shape effects." Case Studies in Thermal Engineering 28, no. : 101378.
The thermal enhancement characteristics of a solar thermal collector (STC) roughened with single arc protrusion ribs are investigated. Out of various techniques used for enhancing the performance of STC, jet impingement and artificial roughness (AR) have a dominant role in heat transfer augmentation. The impinging air jets STC is roughened with single arc protrusion ribs of different parametric values. The combined impact of artificial roughness and jet impingement on the thermo-hydraulic performance of STC is experimentally investigated. Reynolds number is varied from 4000 to 18,000 during experimentation. The AR parameters; relative height ratio of the rib is varied from 0.8 to 1.7, relative pitch ratio of the rib is varied from 9 to12, angle of arc protrusion rib from 40° to 80°, streamwise variation to dhy ratio (hydraulic diameter) is from 0.39 to 0.56 and spanwise variation to dhy ratio from 0.82 to 0.99 during experimentation. The parametric values of artificial roughness for the optimum thermo-hydraulic performance of 1.5, are found out to be relative height ratio of rib = 1.1, relative pitch ratio of rib = 10, angle of arc protrusion rib = 60°, streamwise variation to dhy ratio = 0.43 and Span wise variation to dhy ratio = 0.86. Artificial neural network modeling of Nurs – Nusselt number and ff – friction factor is also performed which accurately predicts these factors easily.
Raj Kumar; Rahul Nadda; Sushil Kumar; Khusmeet Kumar; Asif Afzal; R.K. Abdul Razak; Mohsen Sharifpur. Heat transfer and friction factor correlations for an impinging air jets solar thermal collector with arc ribs on an absorber plate. Sustainable Energy Technologies and Assessments 2021, 47, 101523 .
AMA StyleRaj Kumar, Rahul Nadda, Sushil Kumar, Khusmeet Kumar, Asif Afzal, R.K. Abdul Razak, Mohsen Sharifpur. Heat transfer and friction factor correlations for an impinging air jets solar thermal collector with arc ribs on an absorber plate. Sustainable Energy Technologies and Assessments. 2021; 47 ():101523.
Chicago/Turabian StyleRaj Kumar; Rahul Nadda; Sushil Kumar; Khusmeet Kumar; Asif Afzal; R.K. Abdul Razak; Mohsen Sharifpur. 2021. "Heat transfer and friction factor correlations for an impinging air jets solar thermal collector with arc ribs on an absorber plate." Sustainable Energy Technologies and Assessments 47, no. : 101523.
The encapsulation technique of phase change materials in the nanodimension is an innovative approach to improve the heat transfer capability and solve the issues of corrosion during the melting process. This new type of nanoparticle is suspended in base fluids call NEPCMs, nanoencapsulated phase change materials. The goal of this work is to analyze the impacts of pertinent parameters on the free convection and entropy generation in an elliptical-shaped enclosure filled with NEPCMs by considering the effect of an inclined magnetic field. To reach the goal, the governing equations (energy, momentum, and mass conservation) are solved numerically by CVFEM. Currently, to overcome the low heat transfer problem of phase change material, the NEPCM suspension is used for industrial applications. Validation of results shows that they are acceptable. The results reveal that the values of N u ave descend with ascending Ha while N gen has a maximum at Ha = 16 . Also, the value of N T , MF increases with ascending Ha . The values of N u ave and N gen depend on nondimensional fusion temperature where good performance is seen in the range of 0.35 < θ f < 0.6 . Also, Nu ave increases 19.9% and ECOP increases 28.8% whereas N gen descends 6.9% when ϕ ascends from 0 to 0.06 at θ f = 0.5 . Nu ave decreases 4.95% while N gen increases by 8.65% when Ste increases from 0.2 to 0.7 at θ f = 0.35 .
Seyyed Masoud Seyyedi; M. Hashemi-Tilehnoee; M. Sharifpur. Effect of Inclined Magnetic Field on the Entropy Generation in an Annulus Filled with NEPCM Suspension. Mathematical Problems in Engineering 2021, 2021, 1 -14.
AMA StyleSeyyed Masoud Seyyedi, M. Hashemi-Tilehnoee, M. Sharifpur. Effect of Inclined Magnetic Field on the Entropy Generation in an Annulus Filled with NEPCM Suspension. Mathematical Problems in Engineering. 2021; 2021 ():1-14.
Chicago/Turabian StyleSeyyed Masoud Seyyedi; M. Hashemi-Tilehnoee; M. Sharifpur. 2021. "Effect of Inclined Magnetic Field on the Entropy Generation in an Annulus Filled with NEPCM Suspension." Mathematical Problems in Engineering 2021, no. : 1-14.
This paper presents a review of literature on the effects of using nanofluids (NFs) in energy systems. First, different types of NFs, including the combination of metal and non-metal particles of nanometer sizes with a base fluid, are introduced. Then, the important properties of different NFs, such as the thermal conductivity coefficient, viscosity, specific heat capacity, and electrical conductivity are discussed. Different physical phenomena associated with NF flows including wettability, aggregation, Brownian movement, migration, nanolayer at the liquid/particle interface, and diffusiophoresis are discussed. It is shown that more accurate results can be obtained by considering these phenomena in the nanofluid flow. Subsequently, hybrid NFs are introduced, and papers related to these NFs are briefly reviewed. In the main part of this review, the application of NFs in different energy systems is discussed, revealing that NFs usually feature improved heat transfer capability compared to pure fluids. Most researchers have used NFs with metal oxide nanoparticles (NPs). Moreover, the existing economic and performance analyses indicate that NFs exhibit acceptable performance and can be used as industrial fluids. Finally, the challenges involved in using NFs in different industries are identified. Most notably these include the high cost of producing NPs, the increase in the pumping power due to an increase in viscosity, the precipitation and agglomeration of NPs with time, the reduction in the thermal conductivity coefficient at high volume fractions, increased wear in these systems, and the effect of NPs on the environment. The use of NFs decreases energy consumption, emissions, waste production, raw material usage, and, hence, damage to the environment.
Ahmad Hajatzadeh Pordanjani; Saeed Aghakhani; Masoud Afrand; Mohsen Sharifpur; Josua P. Meyer; Huijin Xu; Hafiz Muhammad Ali; Nader Karimi; Goshtasp Cheraghian. Nanofluids: Physical phenomena, applications in thermal systems and the environment effects- a critical review. Journal of Cleaner Production 2021, 128573 .
AMA StyleAhmad Hajatzadeh Pordanjani, Saeed Aghakhani, Masoud Afrand, Mohsen Sharifpur, Josua P. Meyer, Huijin Xu, Hafiz Muhammad Ali, Nader Karimi, Goshtasp Cheraghian. Nanofluids: Physical phenomena, applications in thermal systems and the environment effects- a critical review. Journal of Cleaner Production. 2021; ():128573.
Chicago/Turabian StyleAhmad Hajatzadeh Pordanjani; Saeed Aghakhani; Masoud Afrand; Mohsen Sharifpur; Josua P. Meyer; Huijin Xu; Hafiz Muhammad Ali; Nader Karimi; Goshtasp Cheraghian. 2021. "Nanofluids: Physical phenomena, applications in thermal systems and the environment effects- a critical review." Journal of Cleaner Production , no. : 128573.
This study is a model of artificial perceptron neural network including three inputs to predict the Nusselt number and energy consumption in the processing of tomato paste in a shell-and-tube heat exchanger with aluminum oxide nanofluid. The Reynolds number in the range of 150–350, temperature in the range of 70–90 K, and nanoparticle concentration in the range of 2–4% were selected as network input variables, while the corresponding Nusselt number and energy consumption were considered as the network target. The network has 3 inputs, 1 hidden layer with 22 neurons and an output layer. The SOM neural network was also used to determine the number of winner neurons. The advanced optimal artificial neural network model shows a reasonable agreement in predicting experimental data with mean square errors of 0.0023357 and 0.00011465 and correlation coefficients of 0.9994 and 0.9993 for the Nusselt number and energy consumption data set. The obtained values of eMAX for the Nusselt number and energy consumption are 0.1114, and 0.02, respectively. Desirable results obtained for the two factors of correlation coefficient and mean square error indicate the successful prediction by artificial neural network with a topology of 3-22-2.
Amir Zolghadri; Heydar Maddah; Mohammad Ahmadi; Mohsen Sharifpur. Predicting Parameters of Heat Transfer in a Shell and Tube Heat Exchanger Using Aluminum Oxide Nanofluid with Artificial Neural Network (ANN) and Self-Organizing Map (SOM). Sustainability 2021, 13, 8824 .
AMA StyleAmir Zolghadri, Heydar Maddah, Mohammad Ahmadi, Mohsen Sharifpur. Predicting Parameters of Heat Transfer in a Shell and Tube Heat Exchanger Using Aluminum Oxide Nanofluid with Artificial Neural Network (ANN) and Self-Organizing Map (SOM). Sustainability. 2021; 13 (16):8824.
Chicago/Turabian StyleAmir Zolghadri; Heydar Maddah; Mohammad Ahmadi; Mohsen Sharifpur. 2021. "Predicting Parameters of Heat Transfer in a Shell and Tube Heat Exchanger Using Aluminum Oxide Nanofluid with Artificial Neural Network (ANN) and Self-Organizing Map (SOM)." Sustainability 13, no. 16: 8824.
In this paper, the free convective heat transfer of nanofluids in a square cavity is simulated using a numerical method. The angle of the cavity could be changed in the horizontal axis from 0 to 90 degrees. The cavity is exposed under a constant magnetic field. Two opposite walls of the cavity are cold and warm, and the rest of the walls are insulated. On the hot wall, there are two fins with the same wall temperature. The equations were discretized by the finite volume method (FVM) and then solved using the SIMPLE algorithm. Three different fin configurations (straight, inclined and curved) were studied in terms of heat transfer rate and generation of entropy. According to the simulation results, the heat transfer rate was improved by tilting the fins toward the top or bottom of the cavity. At Ra = 105 and Ha = 20, the maximum heat transfer rate was achieved at a cavity inclination of 90° and 45°, respectively, for straight and curved fins. In the horizontal cavity, heat transfer rate could be improved up to 6.4% by tilting the fins and up to 4.9% by warping them. Increasing the Hartmann number from 0 to 40 reduced the Nusselt number and entropy generation by 37.9% and 33.8%, respectively.
Yacine Khetib; Ahmad Alahmadi; Ali Alzaed; Hamidreza Azimy; Mohsen Sharifpur; Goshtasp Cheraghian. Effect of Straight, Inclined and Curved Fins on Natural Convection and Entropy Generation of a Nanofluid in a Square Cavity Influenced by a Magnetic Field. Processes 2021, 9, 1339 .
AMA StyleYacine Khetib, Ahmad Alahmadi, Ali Alzaed, Hamidreza Azimy, Mohsen Sharifpur, Goshtasp Cheraghian. Effect of Straight, Inclined and Curved Fins on Natural Convection and Entropy Generation of a Nanofluid in a Square Cavity Influenced by a Magnetic Field. Processes. 2021; 9 (8):1339.
Chicago/Turabian StyleYacine Khetib; Ahmad Alahmadi; Ali Alzaed; Hamidreza Azimy; Mohsen Sharifpur; Goshtasp Cheraghian. 2021. "Effect of Straight, Inclined and Curved Fins on Natural Convection and Entropy Generation of a Nanofluid in a Square Cavity Influenced by a Magnetic Field." Processes 9, no. 8: 1339.
In the current Molecular Dynamics (MD) study, the Fe nanoparticles with various shapes were inserted into H2O molecules to investigate the atomic and thermal performance of H2O/Fe nanofluid. The atomic and thermal behavior of simulated structures is reported by potential energy, thermal conductivity, density, velocity, and temperature profiles. MD simulation results show the spherical nanoparticles have a considerable impact on H2O/Fe nanofluid behavior. By adding these nanoparticles to the thermal conductivity, they reach 1.14 W/m K. Furthermore, temperature profiles, density and velocity are affected by nanoparticle adding to the base fluid. Numerically, the maximum value of these profiles varies from 0.030 atom/Å3, 0.0034 Å/fs, and 355 K to 0.038 atom/Å3, 0.0054 Å/fs, and 465 K by nanoparticles shape changes from spherical type to cubic one. We expected these computational results to be significant for practical application to heat and mass transfer phenomena.
Yunhong Shi; Awatef Abidi; Yacine Khetib; Long Zhang; Mohsen Sharifpur; Goshtasp Cheraghian. The computational study of nanoparticles shape effects on thermal behavior of H2O-Fe nanofluid: A molecular dynamics approach. Journal of Molecular Liquids 2021, 117093 .
AMA StyleYunhong Shi, Awatef Abidi, Yacine Khetib, Long Zhang, Mohsen Sharifpur, Goshtasp Cheraghian. The computational study of nanoparticles shape effects on thermal behavior of H2O-Fe nanofluid: A molecular dynamics approach. Journal of Molecular Liquids. 2021; ():117093.
Chicago/Turabian StyleYunhong Shi; Awatef Abidi; Yacine Khetib; Long Zhang; Mohsen Sharifpur; Goshtasp Cheraghian. 2021. "The computational study of nanoparticles shape effects on thermal behavior of H2O-Fe nanofluid: A molecular dynamics approach." Journal of Molecular Liquids , no. : 117093.
The solution(s) to issues of electric power availability is a great concern in many places in both underdeveloped and developing countries. A solution to this problem is proposed in the use of the Solar Chimney (SC). In this study the potentials of using the Solar Chimney is analysed as a means of improving the power problem and providing ventilation at the same time in building in Nigeria. The Solar chimney (SC) being a natural flow device that uses solar irradiation to cause buoyancy in flowing air by means of the addition of heat, thereby converting the solar thermal energy of the sun into kinetic energy in the flowing air. The SC had been developed for the purpose of ventilation for over two millennia now, while the SC has also been developed in recent time for power generation. In this study computational analysis was carried out using the ANSYS Fluent CFD package together with a statistical package “Design Expert” to carryout sensitivity analysis to determining the potentials of the SC system for buildings. A 23 factorial experiment was simulated and analysed on a 4 m × 4 m × 4 m room. Results revealed by the simulated factorial experiments that the effect of interactions of parametric factors of the SC, chimney height, width and Solar heat flux, were of great importance. The power output from the SC is about 25 W/m2, with a channel velocity of 1.5 m/s. The room temperature was maintained as its initial value of 300 K, with an increase in room average velocity to about 1.5 m/s.
A.T. Layeni; M.A. Waheed; B.A. Adewumi; C.N. Nwaokocha; M. Sharifpur; S.O. Tongo; R.C. Okeze; C.A. Mboreha. Computational and sensitivity analysis of a dual purpose solar chimney for buildings. Materials Today: Proceedings 2021, 1 .
AMA StyleA.T. Layeni, M.A. Waheed, B.A. Adewumi, C.N. Nwaokocha, M. Sharifpur, S.O. Tongo, R.C. Okeze, C.A. Mboreha. Computational and sensitivity analysis of a dual purpose solar chimney for buildings. Materials Today: Proceedings. 2021; ():1.
Chicago/Turabian StyleA.T. Layeni; M.A. Waheed; B.A. Adewumi; C.N. Nwaokocha; M. Sharifpur; S.O. Tongo; R.C. Okeze; C.A. Mboreha. 2021. "Computational and sensitivity analysis of a dual purpose solar chimney for buildings." Materials Today: Proceedings , no. : 1.
The viscosity measurements of magnetic nanofluid subjected to the magnetic field are indispensable in various heat transfer studies. Intention of the present discussion is to critically analyze the magnetic field's influence on the working of two viscometers; a Glass capillary viscometer and a DV-E Brookfield viscometer. The novelty of the present study is in the identification of the underlying reason for the massive escalation in viscosity when the magnetic nanofluid is subjected to magnetic field and rectification of the error caused. The stainless-steel spindle in the viscometer is replaced with a non-electrically and non-magnetically conductive nylon spindle to rectify the error. The dynamic viscosity of magnesium ferrite nanofluid of different volume fractions at a temperature of 25 oC in the occurrence of magnetic field was measured. The viscosity of magnetic nanofluid measured using DV-E Brookfield viscometer escalated to a maximum of 725% over the same measured using glass capillary viscometer with the magnetic field application. The application of the nylon spindle in the viscometer eliminates the error caused due to the eddy current formation in the spindle. Therefore, this study recommends using viscometers with non-electrically and non-magnetically conductive spindles for accuracy while measuring the viscosity of magnetic fluids.
K. Ajith; Archana Sumohan Pillai; I.V. Muthu Vijayan Enoch; M. Sharifpur; A. Brusly Solomon; J.P. Meyer. Effect of the non-electrically conductive spindle on the viscosity measurements of nanofluids subjected to the magnetic field. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2021, 127252 .
AMA StyleK. Ajith, Archana Sumohan Pillai, I.V. Muthu Vijayan Enoch, M. Sharifpur, A. Brusly Solomon, J.P. Meyer. Effect of the non-electrically conductive spindle on the viscosity measurements of nanofluids subjected to the magnetic field. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2021; ():127252.
Chicago/Turabian StyleK. Ajith; Archana Sumohan Pillai; I.V. Muthu Vijayan Enoch; M. Sharifpur; A. Brusly Solomon; J.P. Meyer. 2021. "Effect of the non-electrically conductive spindle on the viscosity measurements of nanofluids subjected to the magnetic field." Colloids and Surfaces A: Physicochemical and Engineering Aspects , no. : 127252.
The authors of the present paper sought to conduct a numerical study on the convection heat transfer, along with the radiation and entropy generation (EGE) of a nanofluids (NFs) in a two and three-dimensional square enclosure, by using the FVM. The enclosure contained a high-temperature blade in the form of a vertical elliptical quadrant in the lower corner of the enclosure. The right edge of the enclosure was kept at low temperature, while the other edges were insulated. The enclosure was subjected to a magnetic field (MGF) and could be adjusted to different angles. In this research, two laboratory relationships dependent on temperature and volume fraction were used to simulate thermal conductivity and viscosity. The variables of this problem were Ra, Ha, RAP, nanoparticle (NP) volume fraction, blade aspect ratio, enclosure angles, and MGF. Evaluating the effects of these variables on heat transfer rate (HTR), EGE, and Be revealed that increasing the Ra and reducing the Ha could increase the HTR and EGE. On the other hand, adding radiation HTR to the enclosure increased the overall HTR. Moreover, an augmentation of the volume fraction of magnesium oxide NPs led to an increased amount of HTR and EGE. Furthermore, any changes to the MGF and the enclosure angle imposed various effects on the HTR. The results indicated that an augmentation of the size of the blade increased and then decreased the HTR and the generated entropy. Finally, increasing the blade always increased the Be.
Yacine Khetib; Ahmad Alahmadi; Ali Alzaed; Ahamd Tahmasebi; Mohsen Sharifpur; Goshtasp Cheraghian. Natural Convection and Entropy Generation of MgO/Water Nanofluids in the Enclosure under a Magnetic Field and Radiation Effects. Processes 2021, 9, 1277 .
AMA StyleYacine Khetib, Ahmad Alahmadi, Ali Alzaed, Ahamd Tahmasebi, Mohsen Sharifpur, Goshtasp Cheraghian. Natural Convection and Entropy Generation of MgO/Water Nanofluids in the Enclosure under a Magnetic Field and Radiation Effects. Processes. 2021; 9 (8):1277.
Chicago/Turabian StyleYacine Khetib; Ahmad Alahmadi; Ali Alzaed; Ahamd Tahmasebi; Mohsen Sharifpur; Goshtasp Cheraghian. 2021. "Natural Convection and Entropy Generation of MgO/Water Nanofluids in the Enclosure under a Magnetic Field and Radiation Effects." Processes 9, no. 8: 1277.
In this study, the convective mode heat transfer phenomena of bi-phase elasticoviscous (non-Newtonian) nanofluid is quantified by forcefully flowing it through a specially designed microchannel test section. The test section, which is rectangularly cross-sectioned and annexed internally with cylindrical needle ribs is numerically investigated by considering the walls to be maintained at a constant temperature, and to be susceptible to a magnetizing force field. The governing system-state equations are numerically deciphered using control volume procedure and SIMPLEC algorithm. With the Reynolds number (Re) varying in the turbulent range from 3000 to 11,000, the system-state equations are solved using the Eulerian–Eulerian monofluid Two-Phase Model (TPM). For the purpose of achieving an apt geometry based on the best thermo-hydraulic behavior, an optimization study must be mandatory. The geometry of the cylindrical rib consists of h (10 × 10−3, 15 × 10−3, 20 × 10−3), p (1.0, 1.5), and d (8 × 10−3, 10 × 10−3, 12 × 10−3), which, respectively, defines the height, pitch, and diameter of the obstacles, with the dimensions placed within the braces being quantified in mm. The results demonstrated that the magnetic field leads to an enhanced amount of average Nusselt number (Nuav) in contrast with the occurrence at B = 0.0. This is due to the that the magnetic field pushes nanoparticles towards the bottom wall. It was found that B = 0.5 T has the maximum heat transfer compared with the other magnetic fields. The channel with h = 15 μm height leads to the maximum value of Nuav at all studied
Yacine Khetib; Ahmad Alahmadi; Ali Alzaed; Suseel Jai Krishnan; Mohsen Sharifpur; Goshtasp Cheraghian. Application of Cylindrical Fin to Improve Heat Transfer Rate in Micro Heat Exchangers Containing Nanofluid under Magnetic Field. Processes 2021, 9, 1278 .
AMA StyleYacine Khetib, Ahmad Alahmadi, Ali Alzaed, Suseel Jai Krishnan, Mohsen Sharifpur, Goshtasp Cheraghian. Application of Cylindrical Fin to Improve Heat Transfer Rate in Micro Heat Exchangers Containing Nanofluid under Magnetic Field. Processes. 2021; 9 (8):1278.
Chicago/Turabian StyleYacine Khetib; Ahmad Alahmadi; Ali Alzaed; Suseel Jai Krishnan; Mohsen Sharifpur; Goshtasp Cheraghian. 2021. "Application of Cylindrical Fin to Improve Heat Transfer Rate in Micro Heat Exchangers Containing Nanofluid under Magnetic Field." Processes 9, no. 8: 1278.
In the current numerical study, various wall shape effects are investigated on the thermal-hydraulic characteristics of different channels filled with water-based graphite-SiO2 hybrid nanofluid. In this work, the performance evaluation criteria (PEC) index is employed as the target parameter to attain optimum geometry. Six different cases are studied in this research, and each case has different geometrical dimensions. The inlet temperature for the fluids in the channel is 300 K, over a range of different flow velocities. According to the obtained results, an increase in the volume fraction of nanoparticles results in higher PEC values. In addition, an increase in Reynolds number to Re = leads to an increase in the PEC index. The results clearly show that increasing the Reynolds number has two consequences: on the one hand, it increases the pressure drop penalty; on the other hand, it improves heat transfer. Therefore, the maximum value of the PEC index occurs at Re = 15,000.
Yacine Khetib; Ahmad Alahmadi; Ali Alzaed; Ahamd Tahmasebi; Mohsen Sharifpur; Goshtasp Cheraghian. Effects of Different Wall Shapes on Thermal-Hydraulic Characteristics of Different Channels Filled with Water Based Graphite-SiO2 Hybrid Nanofluid. Processes 2021, 9, 1253 .
AMA StyleYacine Khetib, Ahmad Alahmadi, Ali Alzaed, Ahamd Tahmasebi, Mohsen Sharifpur, Goshtasp Cheraghian. Effects of Different Wall Shapes on Thermal-Hydraulic Characteristics of Different Channels Filled with Water Based Graphite-SiO2 Hybrid Nanofluid. Processes. 2021; 9 (7):1253.
Chicago/Turabian StyleYacine Khetib; Ahmad Alahmadi; Ali Alzaed; Ahamd Tahmasebi; Mohsen Sharifpur; Goshtasp Cheraghian. 2021. "Effects of Different Wall Shapes on Thermal-Hydraulic Characteristics of Different Channels Filled with Water Based Graphite-SiO2 Hybrid Nanofluid." Processes 9, no. 7: 1253.
Flow and thermal features of nanofluid pool boiling on a circular heat sink with mirco-fins attached were numerically investigated. The initial geometry consisted of a horizontal cylinder with an outside diameter of 20 mm submerged in a saturated water/nanofluid for validation cases. Physical micro-fins with various configurations were added to the outside surface of the cylinder for the purpose of this study. Due to the presence of nanoparticles, three phases were considered in modelling as liquid, vapour and particles. Unsteady Eulerian- Eulerian from multiphase two-phase flow approach was combined with wall boiling model to identify the heat and mass transfer at the hot surface, as well as interaction forces between the liquid and vapour phases. For the case of nanofluid, thermo-physical properties were modified based on particles concentration. To track the fate of nanoparticles, discrete phase modelling was employed from the Lagrangian frame. To solve the boiling heat transfer at the hot surface and fins, nucleate site density and bubbles diameter were modified and implemented to account for the presence of nanoparticles and corrected roughness. All the equations were discretised and solved by CFD commercial software, ANSYS-Fluent v19.5. The results showed that the impacts of fin aspect ratio on heat transfer are higher compared to the number of fins. However, the role of these geometrical parameters decreased as the nanofluid concentration increased. In addition, it was found that the best enhancement in heat transfer was obtained for nanofluid volume fraction around 1% vol.
Mostafa Mahdavi; Mohsen Sharifpur; Hikmet S. Aybar; Ali J. Chamkha; Josua P. Meyer. Impact of micro-fins on a heated cylinder submerged in a nanofluid saturated medium. International Journal of Heat and Mass Transfer 2021, 177, 121551 .
AMA StyleMostafa Mahdavi, Mohsen Sharifpur, Hikmet S. Aybar, Ali J. Chamkha, Josua P. Meyer. Impact of micro-fins on a heated cylinder submerged in a nanofluid saturated medium. International Journal of Heat and Mass Transfer. 2021; 177 ():121551.
Chicago/Turabian StyleMostafa Mahdavi; Mohsen Sharifpur; Hikmet S. Aybar; Ali J. Chamkha; Josua P. Meyer. 2021. "Impact of micro-fins on a heated cylinder submerged in a nanofluid saturated medium." International Journal of Heat and Mass Transfer 177, no. : 121551.
The present experimental work is performed to investigate the convection heat transfer (HT), pressure drop (PD), irreversibility, exergy efficiency and thermal performance for turbulent flow inside a uniformly heated circular channel fitted with novel geometry of hybrid tape. Air is taken as the working fluid and the Reynolds number is varied from 10,000 to 80,000. Hybrid tape is made up of a combination of grooved spring tape and wavy tape. The results obtained with the novel hybrid tape show significantly better performance over individual tapes. A correlation has been developed for predicting the friction factor (f) and Nusselt number (Nu) with novel hybrid tape. The results of this investigation can be used in designing heat exchangers. This paper also presented a statistical analysis of the heat transfer and fluid flow by developing an artificial neural network (ANN)-based machine learning (ML) model. The model is trained based on the features of experimental data, which provide an estimation of experimental output based on user-defined input parameters. The model is evaluated to have an accuracy of 98.00% on unknown test data. These models will help the researchers working in heat transfer enhancement-based experiments to understand and predict the output. As a result, the time and cost of the experiments will reduce.
Suvanjan Bhattacharyya; Devendra Vishwakarma; Shramona Chakraborty; Rahul Roy; Alibek Issakhov; Mohsen Sharifpur. Turbulent Flow Heat Transfer through a Circular Tube with Novel Hybrid Grooved Tape Inserts: Thermohydraulic Analysis and Prediction by Applying Machine Learning Model. Sustainability 2021, 13, 3068 .
AMA StyleSuvanjan Bhattacharyya, Devendra Vishwakarma, Shramona Chakraborty, Rahul Roy, Alibek Issakhov, Mohsen Sharifpur. Turbulent Flow Heat Transfer through a Circular Tube with Novel Hybrid Grooved Tape Inserts: Thermohydraulic Analysis and Prediction by Applying Machine Learning Model. Sustainability. 2021; 13 (6):3068.
Chicago/Turabian StyleSuvanjan Bhattacharyya; Devendra Vishwakarma; Shramona Chakraborty; Rahul Roy; Alibek Issakhov; Mohsen Sharifpur. 2021. "Turbulent Flow Heat Transfer through a Circular Tube with Novel Hybrid Grooved Tape Inserts: Thermohydraulic Analysis and Prediction by Applying Machine Learning Model." Sustainability 13, no. 6: 3068.
The energy efficiency (EnE) and exergy efficiency (ExE) investigations of passive and active inclined solar still (PISS and AISS) are presented in this work. The PISS produced maximum EnE and ExE of 40.21 and 2.88% and the AISS produced maximum EnE and ExE of 48.38 and 6.71%, respectively. The distilled water production, EnE, ExE of the AISS is 47, 16.89, and 57.08% higher than that of the PISS. The daily power generation from the photovoltaic (PV) panel in the PISS is 69 W, and that in the AISS is 52 W. The daily electrical efficiency of the PV panel in the PISS is 9.17%, while that in the AISS is 7.20%. Moreover, the daily average overall EnE, daily average overall ExE, and economic analysis of the PISS and the AISS are calculated. The daily overall EnE and ExE of the system are higher in the case of AISS in comparison to the PISS. The overall daily EnE and ExE of the AISS are 5.24 and 29.63% higher as compared to the PISS. Also, the cost of yield production is noted to be cheaper in AISS (0.018 $/L) when compared to the PISS (0.029 $/L).
M. Mohamed Thalib; M. Vimala; A. Muthu Manokar; Ravishankar Sathyamurthy; Milad Sadeghzadeh; Mohsen Sharifpur. Energy, exergy and economic investigation of passive and active inclined solar still: experimental study. Journal of Thermal Analysis and Calorimetry 2021, 145, 1091 -1102.
AMA StyleM. Mohamed Thalib, M. Vimala, A. Muthu Manokar, Ravishankar Sathyamurthy, Milad Sadeghzadeh, Mohsen Sharifpur. Energy, exergy and economic investigation of passive and active inclined solar still: experimental study. Journal of Thermal Analysis and Calorimetry. 2021; 145 (3):1091-1102.
Chicago/Turabian StyleM. Mohamed Thalib; M. Vimala; A. Muthu Manokar; Ravishankar Sathyamurthy; Milad Sadeghzadeh; Mohsen Sharifpur. 2021. "Energy, exergy and economic investigation of passive and active inclined solar still: experimental study." Journal of Thermal Analysis and Calorimetry 145, no. 3: 1091-1102.
The goal of the present paper is the investigation of a solar desalination system with an organic Rankine cycle system for power and freshwater production. This system is an environmentally friendly technology that is able to utilize solar energy properly in a novel cogeneration application. A parabolic trough concentrator with a smooth and corrugated receiver was employed as the heat source of the desalination system. A humidifier–dehumidifier desalination technology was used for producing freshwater. The electricity is produced by an organic Rankine cycle which is fed both by the solar field and by the hot brine. The present analysis is performed by using a detailed numerical model which is validated by experimental literature data. Based on the final results, the corrugated tube has a maximum performance of 66.59%, and it is more efficient than the smooth tube with 63.11%. The average freshwater productions were estimated equal to 13.09 kg hr−1 and 12.71 kg hr−1 for the corrugated and smooth tubes, respectively. The maximum net work production is found at 7.57 kW with R113, while the less efficient working fluid is R134a. It was found that the application of the developed desalination system leads to the production of high amounts of fresh water and a significant reduction of the equivalent CO2 emissions.
Alireza Rafiei; Reyhaneh Loni; Gholamhassan Najafi; Shuhaimi B. Mahadzir; Evangelos Bellos; Mohsen Sharifpur; Mohamed Mazlan. Assessment of a solar-driven cogeneration system for electricity and desalination. Journal of thermal analysis 2021, 145, 1711 -1731.
AMA StyleAlireza Rafiei, Reyhaneh Loni, Gholamhassan Najafi, Shuhaimi B. Mahadzir, Evangelos Bellos, Mohsen Sharifpur, Mohamed Mazlan. Assessment of a solar-driven cogeneration system for electricity and desalination. Journal of thermal analysis. 2021; 145 (3):1711-1731.
Chicago/Turabian StyleAlireza Rafiei; Reyhaneh Loni; Gholamhassan Najafi; Shuhaimi B. Mahadzir; Evangelos Bellos; Mohsen Sharifpur; Mohamed Mazlan. 2021. "Assessment of a solar-driven cogeneration system for electricity and desalination." Journal of thermal analysis 145, no. 3: 1711-1731.
The superiority of nanofluid over conventional working fluid has been well researched and proven. Newest on the horizon is the hybrid nanofluid currently being examined due to its improved thermal properties. This paper examined the viscosity and electrical conductivity of deionized water (DIW)-based multiwalled carbon nanotube (MWCNT)-Fe2O3 (20:80) nanofluids at temperatures and volume concentrations ranging from 15 °C to 55 °C and 0.1–1.5%, respectively. The morphology of the suspended hybrid nanofluids was characterized using a transmission electron microscope, and the stability was monitored using visual inspection, UV–visible, and viscosity-checking techniques. With the aid of a viscometer and electrical conductivity meter, the viscosity and electrical conductivity of the hybrid nanofluids were determined, respectively. The MWCNT-Fe2O3/DIW nanofluids were found to be stable and well suspended. Both the electrical conductivity and viscosity of the hybrid nanofluids were augmented with respect to increasing volume concentration. In contrast, the temperature rise was noticed to diminish the viscosity of the nanofluids, but it enhanced electrical conductivity. Maximum increments of 35.7% and 1676.4% were obtained for the viscosity and electrical conductivity of the hybrid nanofluids, respectively, when compared with the base fluid. The obtained results were observed to agree with previous studies in the literature. After fitting the obtained experimental data, high accuracy was achieved with the formulated correlations for estimating the electrical conductivity and viscosity. The examined hybrid nanofluid was noticed to possess a lesser viscosity in comparison with the mono-particle nanofluid of Fe2O3/water, which was good for engineering applications as the pumping power would be reduced.
Solomon O. Giwa; Mohsen Sharifpur; Mohammad H. Ahmadi; S. M. Sohel Murshed; Josua P. Meyer. Experimental Investigation on Stability, Viscosity, and Electrical Conductivity of Water-Based Hybrid Nanofluid of MWCNT-Fe2O3. Nanomaterials 2021, 11, 136 .
AMA StyleSolomon O. Giwa, Mohsen Sharifpur, Mohammad H. Ahmadi, S. M. Sohel Murshed, Josua P. Meyer. Experimental Investigation on Stability, Viscosity, and Electrical Conductivity of Water-Based Hybrid Nanofluid of MWCNT-Fe2O3. Nanomaterials. 2021; 11 (1):136.
Chicago/Turabian StyleSolomon O. Giwa; Mohsen Sharifpur; Mohammad H. Ahmadi; S. M. Sohel Murshed; Josua P. Meyer. 2021. "Experimental Investigation on Stability, Viscosity, and Electrical Conductivity of Water-Based Hybrid Nanofluid of MWCNT-Fe2O3." Nanomaterials 11, no. 1: 136.
In this paper, a model-based fault diagnosis scheme of a nonlinear hybrid system using an adaptive unscented Kalman filter (AUKF) bank is proposed. The hybrid system is an amalgamation of discrete dynamics and continuous states. Fault diagnosis for simultaneous occurrences of multiple faults such as leakage fault, clogging fault, sensor fault, and actuator fault on a benchmark three-tank system are simulated. The residual signal based output generates some discrete modes that guarantee the uniqueness of the concerning fault. The efficacy of the proposed scheme is compared with that of the adaptive extended Kalman filter (AEKF) bank on the same system to prove its better response over AEKF.
Chandrani Sadhukhan; Swarup Kumar Mitra; Mrinal Kanti Naskar; Mohsen Sharifpur. Fault diagnosis of a nonlinear hybrid system using adaptive unscented Kalman filter bank. Engineering with Computers 2021, 1 -12.
AMA StyleChandrani Sadhukhan, Swarup Kumar Mitra, Mrinal Kanti Naskar, Mohsen Sharifpur. Fault diagnosis of a nonlinear hybrid system using adaptive unscented Kalman filter bank. Engineering with Computers. 2021; ():1-12.
Chicago/Turabian StyleChandrani Sadhukhan; Swarup Kumar Mitra; Mrinal Kanti Naskar; Mohsen Sharifpur. 2021. "Fault diagnosis of a nonlinear hybrid system using adaptive unscented Kalman filter bank." Engineering with Computers , no. : 1-12.
The present work investigates heat transfer through natural convection using a series of experiments and computational modeling using Computational Fluid Dynamics (CFD) simulations in a one-meter bundle pipe with three internal pipes. The exact complex geometry is modeled where the flow channel is reduced through a spiral groove attached to a rod inside the internal tubes which was challenging compared to the flow in circular pipes in previous studies. To support the computational modeling investigations, convective heat transfer analysis is also studied through experiments with water as the production and heating fluids. Further, simulations are carried out with water-crude oil and aqueous ethylene glycol-water as the heating mediums and production fluids, respectively. Based on the heat transfer rates estimated from experimental data and CFD simulation results for the respective tubes, a modification to an existing Nusselt number is proposed for the range of temperature and flow rates used in the experiments. The proposed model, Nui = Prim Rain, was validated against experimental data and a good agreement with R2 values of more than 0.94 was achieved.
Ola Karar; Sampath Emani; Ramasamy Marappa Gounder; Maung Maung Myo Thant; Hilmi Mukhtar; Mohsen Sharifpur; Milad Sadeghzadeh. Experimental and numerical investigation on convective heat transfer in actively heated bundle-pipe. Engineering Applications of Computational Fluid Mechanics 2021, 15, 848 -864.
AMA StyleOla Karar, Sampath Emani, Ramasamy Marappa Gounder, Maung Maung Myo Thant, Hilmi Mukhtar, Mohsen Sharifpur, Milad Sadeghzadeh. Experimental and numerical investigation on convective heat transfer in actively heated bundle-pipe. Engineering Applications of Computational Fluid Mechanics. 2021; 15 (1):848-864.
Chicago/Turabian StyleOla Karar; Sampath Emani; Ramasamy Marappa Gounder; Maung Maung Myo Thant; Hilmi Mukhtar; Mohsen Sharifpur; Milad Sadeghzadeh. 2021. "Experimental and numerical investigation on convective heat transfer in actively heated bundle-pipe." Engineering Applications of Computational Fluid Mechanics 15, no. 1: 848-864.
This paper presents reliability, availability, and maintainability (RAM) analysis framework for evaluating the performance of a circulation system of water (WCS) used in a coal-fired power plant (CFPP). The performance of WCS is evaluated using a reliability block diagram (RBD), fault tree analysis (FTA), and Markov birth–death probabilistic approach. In this work, the system under study consists of five subsystems connected in series and parallel configuration namely condensate extraction pump (CEP), low-pressure feed water heater (LPH), deaerator (DR), boiler feed pump (BFP), high-pressure feed water heater (HPH). The reliability block diagram (RBD) and fault tree approach (FTA) have been employed for the performance evaluation of WCS. The Markov probabilistic approach based simulation model is developed. The transition diagram of the proposed model represented several states with full working capacity, reduced capacity, and failed state. The ranking of critical equipment is decided on the basis of criticality level of equipment. The study results revealed that the boiler feed pump affects the system availability at most, while the failure of deaerator affects it least. The availability of the system is optimized using the particle swarm optimization method. The optimized availability parameter (TBF, TTR) based modified maintenance strategy is recommended to enhance the availability of the plant system. The optimized failure rate and repair rate parameters of the subsystem are used to suggest a suitable maintenance strategy for the water circulation system of the thermal power plant. The proposed RAM framework helps the decision-makers to plan the maintenance activity as per the criticality level of subsystems and allocate the resources accordingly.
Hanumant P. Jagtap; Anand K. Bewoor; Ravinder Kumar; Mohammad Hossein Ahmadi; Mamdouh El Haj Assad; Mohsen Sharifpur. RAM analysis and availability optimization of thermal power plant water circulation system using PSO. Energy Reports 2020, 7, 1133 -1153.
AMA StyleHanumant P. Jagtap, Anand K. Bewoor, Ravinder Kumar, Mohammad Hossein Ahmadi, Mamdouh El Haj Assad, Mohsen Sharifpur. RAM analysis and availability optimization of thermal power plant water circulation system using PSO. Energy Reports. 2020; 7 ():1133-1153.
Chicago/Turabian StyleHanumant P. Jagtap; Anand K. Bewoor; Ravinder Kumar; Mohammad Hossein Ahmadi; Mamdouh El Haj Assad; Mohsen Sharifpur. 2020. "RAM analysis and availability optimization of thermal power plant water circulation system using PSO." Energy Reports 7, no. : 1133-1153.