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One of the remaining bottlenecks of PEM fuel cell vehicle commercialization as a probable alternative to conventional vehicles is the performance degradation during dynamic loads. Herein, an innovative coupling is presented between a three-dimensional, multiphase computational fluid dynamic simulation with eight conservation equations and a novel degradation model to predict the performance loss of PEM fuel cell under vehicular load cycling. Moreover, a multi-objective optimization problem with four different scenarios is also planned for the first time as the other novelty, to minimize the cell power density loss as well as maximize the initial cell power density, in order to find the optimum value of some operating and structural parameters. The model predicts the power density degradation rate of about 0.001627 kW cycle−1 (equivalent to 4.067 kW m−2 loss after 2500 cycles) which is in good agreement with experimental data. The results reveal that the operating temperature is the most influential parameter with rank 1 for the cost functions. The optimization results also show a considerable enhancement of about 36.9% in the final power density after load cycling compared to the base case conditions by fine-tuning five operating and structural parameters.
M. Moein-Jahromi; M.J. Kermani. Three-dimensional multiphase simulation and multi-objective optimization of PEM fuel cells degradation under automotive cyclic loads. Energy Conversion and Management 2021, 231, 113837 .
AMA StyleM. Moein-Jahromi, M.J. Kermani. Three-dimensional multiphase simulation and multi-objective optimization of PEM fuel cells degradation under automotive cyclic loads. Energy Conversion and Management. 2021; 231 ():113837.
Chicago/Turabian StyleM. Moein-Jahromi; M.J. Kermani. 2021. "Three-dimensional multiphase simulation and multi-objective optimization of PEM fuel cells degradation under automotive cyclic loads." Energy Conversion and Management 231, no. : 113837.
A pore network model (PNM) is developed for gas diffusion layer (GDL) in the cathode side of polymer electrolyte membrane fuel cells (PEMFCs). The model is coupled to network models of reactant oxygen and electron transport inside GDL and also to simple models of catalyst layer and membrane. The coupled model captures the simultaneous effect of reactant and charge access to reaction sites and the resulting water generation, allowing it a transient nature up to reaching the steady state, which is a notable modification to the available PNMs which assume uniform invasion of liquid water from catalyst layer. The results show strongly non-uniform water saturation distributions inside GDL with maxima under the current collector ribs. As an extra feature, the model can predict time evolution of oxygen concentration and water generation rate at catalyst layer as a result of liquid water build-up in GDL. Also included is a dry case coupled model in order to be compared with the main model. The local water blockages in GDL inflict an average of 38.8% loss on the produced limiting current of the fuel cell. Finally, the coupling allows prediction of concentration overvoltages which emerges to be most pronounced in the under-rib region.
Hamed Gholipour; Mohammad J. Kermani; Rahim Zamanian. Coupled pore network model for the cathode gas diffusion layer in PEM fuel cells. Acta Mechanica Sinica 2020, 37, 331 -348.
AMA StyleHamed Gholipour, Mohammad J. Kermani, Rahim Zamanian. Coupled pore network model for the cathode gas diffusion layer in PEM fuel cells. Acta Mechanica Sinica. 2020; 37 (2):331-348.
Chicago/Turabian StyleHamed Gholipour; Mohammad J. Kermani; Rahim Zamanian. 2020. "Coupled pore network model for the cathode gas diffusion layer in PEM fuel cells." Acta Mechanica Sinica 37, no. 2: 331-348.
Water management is a key issue in low-temperature PEMFCs. For proper water management, processes leading to dehydration or flooding of cells should be clearly understood, hence prevented. Here, the effects of Anode Stoichiometry (AST), Cathode Stoichiometry (CST) and inlet gas temperature (T*) on the cell performance and water management in PEMFC are experimentally studied. Two methods, namely (i) direct- and (ii) indirect-method are employed to monitor water accumulation in cathode flow channels of a multi-path-parallel-serpentine PEMFC. Flow visualization served as direct method (item (i)), in which recorded videos of transparent channels were analyzed via an image-processing algorithm to monitor water coverage ratio (WCR). Simultaneously an inlet-to-exit pressure drop coefficient (Φ) was defined for indirect-method (item (ii)). AST, CST and T* were taken as input to provide three experimental based correlations for generated electrical power, WCR and Φ as a response. According to the results, an increase in AST reduces water-content in cathode channels; decreases performance also raises the sensitivity of generated power to variations in other operating-parameters. However, an increase in CST and T* reduces water contents in cathode channels also increases the cell power and lowers sensitivity of the power to the variation of other operating-parameters. It is observed that strong connectivity exists between WCR and Φ. This is verified by obtaining a high Pearson correlation coefficient of 0.887 between WCR and Φ. It is demonstrated that dehydration and flooding could be prevented when 3 ≤ WCR ≤ 4, from which appropriate operating-parameters AST, CST and T* could be retrieved.
M. Hasheminasab; M.J. Kermani; S.S. Nourazar; M.H. Khodsiani. A novel experimental based statistical study for water management in proton exchange membrane fuel cells. Applied Energy 2020, 264, 114713 .
AMA StyleM. Hasheminasab, M.J. Kermani, S.S. Nourazar, M.H. Khodsiani. A novel experimental based statistical study for water management in proton exchange membrane fuel cells. Applied Energy. 2020; 264 ():114713.
Chicago/Turabian StyleM. Hasheminasab; M.J. Kermani; S.S. Nourazar; M.H. Khodsiani. 2020. "A novel experimental based statistical study for water management in proton exchange membrane fuel cells." Applied Energy 264, no. : 114713.
In the present work, a two-dimensional, transient, isothermal, two-phase, multicomponent transport model was considered for the anode-side electrode of a PEMFC. The governing equations of two-phase flow in the PEM fuel cell were discretized by finite volume method, and the SIMPLE algorithm was used to handle the pressure-velocity coupling. The discretized governing equations of the model were numerically solved on a non-uniform grid with an in-house developed code. The simulation was performed for velocity, pressure, concentration of species, and liquid water saturation in the anode side of the PEMFC. At first, the steady-state and transient effects of introducing the CO-contaminated hydrogen on the cell performance were investigated. Then, a comprehensive investigation of the commonly used mitigation techniques including the effect of air or oxygen bleeding, elevation of temperature and the effect of using CO-tolerant catalysts (PtRu/C), was conducted. The numerical results of the model were compared and validated with the experimental data. The results indicated that even using a low CO concentration, leads to significant degradation of the fuel cell output current density (about 30% of the output current was lost within 30 min when the hydrogen is pre-mixed with 15 ppm of CO as the fuel). Injecting a small amount of air into the anode stream, resulted in fast recovery of the lost current density (by injecting about 5% air into the fuel, 80% of the output current was recovered within 2 min at 53 ppm CO). Higher air bleeding ratio only resulted in minor improvement of the cell performance. Increasing the cell temperature; also using PtRu/C instead of Pt/C (at low temperatures) led to improving the cell performance. The use of PtRu/C at a high operating temperatures only resulted in minor improvement of the cell performance.
A. Moradi Bilondi; M. Abdollahzadeh; M.J. Kermani; H. Heidary; P. Havaej. Numerical study of anode side CO contamination effects on PEM fuel cell performance; and mitigation methods. Energy Conversion and Management 2018, 177, 519 -534.
AMA StyleA. Moradi Bilondi, M. Abdollahzadeh, M.J. Kermani, H. Heidary, P. Havaej. Numerical study of anode side CO contamination effects on PEM fuel cell performance; and mitigation methods. Energy Conversion and Management. 2018; 177 ():519-534.
Chicago/Turabian StyleA. Moradi Bilondi; M. Abdollahzadeh; M.J. Kermani; H. Heidary; P. Havaej. 2018. "Numerical study of anode side CO contamination effects on PEM fuel cell performance; and mitigation methods." Energy Conversion and Management 177, no. : 519-534.
In this study, the effects of different non-uniform catalyst loading distributions that vary in both lateral and longitudinal directions on the performance of Polymer Electrolyte Membrane Fuel Cell (PEMFC) were numerically examined in detail. A two-phase, multi-component, transient and three-dimensional model was employed for simulating the performance of the cathode half-cell of the PEMFC. At the first step, the best longitudinal catalyst loading distribution was found. At the second step, several lateral distributions were superimposed to the noted longitudinal catalyst loading distribution and the performance of the PEMFC was evaluated for each distribution. Numerical results showed 3.1% enhancement for the longitudinal catalyst loading distributions; while 8% improvement was observed with a non-uniform catalyst loading distribution in both longitudinal and lateral directions. Results indicated that when lateral distribution is employed, liquid water saturation in the rib side is reduced. In the best longitudinal distribution, the ratio of platinum loading in longitudinal direction was 1.857 and the ratio of platinum catalyst from the center region of the catalyst layer to the rib side is varied in a wide range. In the case of the noted ratio more than 30, the enhancement in the PEMFC performance was insignificant. Finally, the effect of catalyst loading distribution was investigated on the polarization curves. It was found that the catalyst loading distribution is most effective at the high current densities while it has a minor effect at low current densities.
P. Havaej; M.J. Kermani; MohammadMahdi Abdollahzadehsangroudi; Hadi Heidary; A. Moradi. A numerical modeling study on the influence of catalyst loading distribution on the performance of Polymer Electrolyte Membrane Fuel Cell. International Journal of Hydrogen Energy 2018, 43, 10031 -10047.
AMA StyleP. Havaej, M.J. Kermani, MohammadMahdi Abdollahzadehsangroudi, Hadi Heidary, A. Moradi. A numerical modeling study on the influence of catalyst loading distribution on the performance of Polymer Electrolyte Membrane Fuel Cell. International Journal of Hydrogen Energy. 2018; 43 (21):10031-10047.
Chicago/Turabian StyleP. Havaej; M.J. Kermani; MohammadMahdi Abdollahzadehsangroudi; Hadi Heidary; A. Moradi. 2018. "A numerical modeling study on the influence of catalyst loading distribution on the performance of Polymer Electrolyte Membrane Fuel Cell." International Journal of Hydrogen Energy 43, no. 21: 10031-10047.
One key strategy for maximizing the performance of fuel cells is the choice of proper flow field pattern. In this paper, a procedure was developed for the proper design of parallel serpentine flow field for proton exchange membrane fuel cells. Several parameters including the channel width and height, the rib between two adjacent channels, and the numbers of parallel channels and serpentine turns were considered and all the possible flow field configurations within the range of these design parameters were defined. In the next step, six consecutive constraining filters were defined and enforced to all the possible flow field configurations. In the final step, a complete three dimensional simulations were conducted for the remaining cases. Based on the results of the simulations, these cases were ranked, with the best case corresponds to the flow field with the minimum pressure drop, the maximum oxygen content at the surface of catalyst layer, maximum uniformity of oxygen distribution within the catalyst layer and minimum content of the condensate produced within the catalyst layer.
A. Ghanbarian; M.J. Kermani; J. Scholta; MohammadMahdi Abdollahzadehsangroudi. Polymer electrolyte membrane fuel cell flow field design criteria – Application to parallel serpentine flow patterns. Energy Conversion and Management 2018, 166, 281 -296.
AMA StyleA. Ghanbarian, M.J. Kermani, J. Scholta, MohammadMahdi Abdollahzadehsangroudi. Polymer electrolyte membrane fuel cell flow field design criteria – Application to parallel serpentine flow patterns. Energy Conversion and Management. 2018; 166 ():281-296.
Chicago/Turabian StyleA. Ghanbarian; M.J. Kermani; J. Scholta; MohammadMahdi Abdollahzadehsangroudi. 2018. "Polymer electrolyte membrane fuel cell flow field design criteria – Application to parallel serpentine flow patterns." Energy Conversion and Management 166, no. : 281-296.
Navid Zehtabiyan-Rezaie; Amir Arefian; Mohammad J. Kermani; Amir Karimi Noughabi; MohammadMahdi Abdollahzadehsangroudi. Effect of flow field with converging and diverging channels on proton exchange membrane fuel cell performance. Energy Conversion and Management 2017, 152, 31 -44.
AMA StyleNavid Zehtabiyan-Rezaie, Amir Arefian, Mohammad J. Kermani, Amir Karimi Noughabi, MohammadMahdi Abdollahzadehsangroudi. Effect of flow field with converging and diverging channels on proton exchange membrane fuel cell performance. Energy Conversion and Management. 2017; 152 ():31-44.
Chicago/Turabian StyleNavid Zehtabiyan-Rezaie; Amir Arefian; Mohammad J. Kermani; Amir Karimi Noughabi; MohammadMahdi Abdollahzadehsangroudi. 2017. "Effect of flow field with converging and diverging channels on proton exchange membrane fuel cell performance." Energy Conversion and Management 152, no. : 31-44.
Saad S. AlRwashdeh; Ingo Manke; Henning Markötter; Jan Haußmann; Nikolay Kardjilov; André Hilger; Mohammad J. Kermani; Merle Klages; A.M. Al-Falahat; Joachim Scholta; John Banhart. Neutron radiographic in operando investigation of water transport in polymer electrolyte membrane fuel cells with channel barriers. Energy Conversion and Management 2017, 148, 604 -610.
AMA StyleSaad S. AlRwashdeh, Ingo Manke, Henning Markötter, Jan Haußmann, Nikolay Kardjilov, André Hilger, Mohammad J. Kermani, Merle Klages, A.M. Al-Falahat, Joachim Scholta, John Banhart. Neutron radiographic in operando investigation of water transport in polymer electrolyte membrane fuel cells with channel barriers. Energy Conversion and Management. 2017; 148 ():604-610.
Chicago/Turabian StyleSaad S. AlRwashdeh; Ingo Manke; Henning Markötter; Jan Haußmann; Nikolay Kardjilov; André Hilger; Mohammad J. Kermani; Merle Klages; A.M. Al-Falahat; Joachim Scholta; John Banhart. 2017. "Neutron radiographic in operando investigation of water transport in polymer electrolyte membrane fuel cells with channel barriers." Energy Conversion and Management 148, no. : 604-610.
Degradation of Fuel Cell (FC) components under cyclic loads is one of the biggest bottlenecks in FC commercialization. In this paper, a novel experimental based algorithm is presented to predict the Catalyst Layer (CL) performance loss during cyclic load. The algorithm consists of two models namely Models 1 and 2. The Model 1 calculates the Electro-Chemical Surface Area (ECSA) and agglomerate size (e.g. agglomerate radius, rt,agg) for the catalyst layer under cyclic load. The Model 2 is the already-existing model from our earlier studies that computes catalyst performance with fixed structural parameters. Combinations of these two Models predict the CL performance under an arbitrary cyclic load. A set of parametric/sensitivity studies is performed to investigate the effects of operating parameters on the percentage of Voltage Degradation Rate (VDR%) with rank 1 for the most influential one. Amongst the considered parameters (such as: temperature, relative humidity, pressure, minimum and maximum voltage of the cyclic load), the results show that temperature and pressure have the most and the least influences on the VDR%, respectively. So that, increase of temperature from 60 °C to 80 °C leads to over 20% VDR intensification, the VDR will also reduce 1.41% by increasing pressure from 2 atm to 4 atm.
M. Moein-Jahromi; M.J. Kermani; S. Movahed. Degradation forecast for PEMFC cathode-catalysts under cyclic loads. Journal of Power Sources 2017, 359, 611 -625.
AMA StyleM. Moein-Jahromi, M.J. Kermani, S. Movahed. Degradation forecast for PEMFC cathode-catalysts under cyclic loads. Journal of Power Sources. 2017; 359 ():611-625.
Chicago/Turabian StyleM. Moein-Jahromi; M.J. Kermani; S. Movahed. 2017. "Degradation forecast for PEMFC cathode-catalysts under cyclic loads." Journal of Power Sources 359, no. : 611-625.
In the present paper an in-house CFD code is developed using Roe scheme to simulate condensing two-phase flow in blade to blade passage of a steam turbine. Effects of condensation on the flow field of steam turbine rotor tip section are investigated for different outlet pressures. Firstly, comparison is performed between results of wet and dry cases. Then effects of outlet pressure variations on the flow field are studied. Finally effects of condensation on different specifications of the flow field (total pressure loss coefficient, entropy generation and deviation angle) are investigated. Also the mechanism of flow deviation in the cascade flow field is described. Condensation has a great influence on the behavior of the flow field based on the numerical results of this paper. It changes the outflow direction and consequently the flow entering to the next blade deviates from its on-design condition, thus additional losses are produced. For example, the value of deviation angle reaches to 7.62for wet case and exit Mach number Me=1.45. Also there are stagnation pressure loss and entropy generation due to non-equilibrium condensation that reduce the efficiency of the steam turbine
Hamed Bagheri Esfe; Mohammad Kermani; Majid Saffar Avval. Effects of non-equilibrium condensation on aerodynamics of the flow field in a steam turbine cascade. Scientia Iranica 2017, 24, 624 -634.
AMA StyleHamed Bagheri Esfe, Mohammad Kermani, Majid Saffar Avval. Effects of non-equilibrium condensation on aerodynamics of the flow field in a steam turbine cascade. Scientia Iranica. 2017; 24 (2):624-634.
Chicago/Turabian StyleHamed Bagheri Esfe; Mohammad Kermani; Majid Saffar Avval. 2017. "Effects of non-equilibrium condensation on aerodynamics of the flow field in a steam turbine cascade." Scientia Iranica 24, no. 2: 624-634.
Hadi Heidary; Mohammad Kermani; Ajay K. Prasad; Suresh Advani; Bahram Dabir. Numerical modelling of in-line and staggered blockages in parallel flowfield channels of PEM fuel cells. International Journal of Hydrogen Energy 2017, 42, 2265 -2277.
AMA StyleHadi Heidary, Mohammad Kermani, Ajay K. Prasad, Suresh Advani, Bahram Dabir. Numerical modelling of in-line and staggered blockages in parallel flowfield channels of PEM fuel cells. International Journal of Hydrogen Energy. 2017; 42 (4):2265-2277.
Chicago/Turabian StyleHadi Heidary; Mohammad Kermani; Ajay K. Prasad; Suresh Advani; Bahram Dabir. 2017. "Numerical modelling of in-line and staggered blockages in parallel flowfield channels of PEM fuel cells." International Journal of Hydrogen Energy 42, no. 4: 2265-2277.
In this study heat transfer and fluid flow analysis in a wavy channel is numerically studied, while a magnetic field is applied in transverse direction to the main flow stream. Recently in a numerical study, we have observed that usage of wavy channel instead of straight one enhances heat exchange between the core flow and hot walls. On the other hand, the usage of magnetic field transverse to hot walls can enhance heat transfer in a straight channel. In this paper, we would like to examine if presence of these two methods simultaneously is useful for enhancement of heat exchange. For this purpose, the governing equations are numerically solved in the domain by the control volume approach based on the SIMPLE technique. Numerical studies are performed over a range of Reynolds number, Hartmann number, and the wave amplitude. From this study, it is concluded that heat transfer in channels can be enhanced by the usage of magnetic field or usage of wavy channel instead of a straight one. But simultaneous usage of magnetic field and wavy channel is not recommended.
Hadi Heidary; Mohammad Kermani; Bahram Dabir. Magnetic field effect on convective heat transfer in corrugated flow channel. Thermal Science 2017, 21, 2105 -2115.
AMA StyleHadi Heidary, Mohammad Kermani, Bahram Dabir. Magnetic field effect on convective heat transfer in corrugated flow channel. Thermal Science. 2017; 21 (5):2105-2115.
Chicago/Turabian StyleHadi Heidary; Mohammad Kermani; Bahram Dabir. 2017. "Magnetic field effect on convective heat transfer in corrugated flow channel." Thermal Science 21, no. 5: 2105-2115.
Hadi Heidary; Mohammad Kermani; Bahram Dabir. Influences of bipolar plate channel blockages on PEM fuel cell performances. Energy Conversion and Management 2016, 124, 51 -60.
AMA StyleHadi Heidary, Mohammad Kermani, Bahram Dabir. Influences of bipolar plate channel blockages on PEM fuel cell performances. Energy Conversion and Management. 2016; 124 ():51-60.
Chicago/Turabian StyleHadi Heidary; Mohammad Kermani; Bahram Dabir. 2016. "Influences of bipolar plate channel blockages on PEM fuel cell performances." Energy Conversion and Management 124, no. : 51-60.
Hamed Bagheri Esfe; Mohammad Kermani; Majid Saffar Avval; University of Shahreza; Amirkabir University of Technology. Effects of Non-Equilibrium Condensation on Deviation Angle and Performance Losses in Wet Steam Turbines. Journal of Applied Fluid Mechanics 2016, 9, 1627 -1639.
AMA StyleHamed Bagheri Esfe, Mohammad Kermani, Majid Saffar Avval, University of Shahreza, Amirkabir University of Technology. Effects of Non-Equilibrium Condensation on Deviation Angle and Performance Losses in Wet Steam Turbines. Journal of Applied Fluid Mechanics. 2016; 9 (6):1627-1639.
Chicago/Turabian StyleHamed Bagheri Esfe; Mohammad Kermani; Majid Saffar Avval; University of Shahreza; Amirkabir University of Technology. 2016. "Effects of Non-Equilibrium Condensation on Deviation Angle and Performance Losses in Wet Steam Turbines." Journal of Applied Fluid Mechanics 9, no. 6: 1627-1639.
The presence of a blockage in the flowfield channel of a PEM fuel cell can potentially enhance mass transfer of reactant gas from the channel into the catalyst layer and improve performance. Here, we investigate experimentally the effect of in-line and staggered blockage configurations within a parallel flowfield and compare their fuel cell performance results with those of a baseline parallel flowfield without blockages. In the in-line configuration, three blockages are placed in each parallel channel such that they line up with each other when viewed laterally across channels. The staggered configuration also employs three blockages in each channel, but the blockages in adjacent channels are spaced apart such that the blockages in alternate channels line up when viewed laterally. Results show that the staggered configuration enhances cell performance by up to 28% over the baseline case, and by 18% when compared to the in-line case. Performance is improved even after accounting for the higher pumping power required to overcome the increased pressure drop due to the blockages. The presence of under-rib convection in the staggered configuration reduces the pressure drop by 18% when compared to the in-line case which only experiences under-block convection.
Hadi Heidary; Mohammad Kermani; Suresh Advani; Ajay K. Prasad. Experimental investigation of in-line and staggered blockages in parallel flowfield channels of PEM fuel cells. International Journal of Hydrogen Energy 2016, 41, 6885 -6893.
AMA StyleHadi Heidary, Mohammad Kermani, Suresh Advani, Ajay K. Prasad. Experimental investigation of in-line and staggered blockages in parallel flowfield channels of PEM fuel cells. International Journal of Hydrogen Energy. 2016; 41 (16):6885-6893.
Chicago/Turabian StyleHadi Heidary; Mohammad Kermani; Suresh Advani; Ajay K. Prasad. 2016. "Experimental investigation of in-line and staggered blockages in parallel flowfield channels of PEM fuel cells." International Journal of Hydrogen Energy 41, no. 16: 6885-6893.
In this paper, the AUSM-van Leer hybrid scheme is extended to solve the governing equations of two-phase transonic flow in a steam turbine stage. The dominant solver of the computational domain is the non-diffusive AUSM scheme (1993), while a smooth transition from AUSM in regions with large gradients to the diffusive scheme by van Leer (1979) guarantees a robust hybrid scheme throughout the domain. The steam is assumed to obey non-equilibrium thermodynamic model. The effects of condensation on different specifications of the flow field are studied at subsonic/supersonic flow regimes. It is observed that as a result of condensation, the aerothermodymics of the flow field changes. For example in supersonic wet case (P b = 14.55 kPa), pressure loss coefficient of rotor and total entropy generation are, respectively, 77% and 29% more than those in dry conditions. Also the value of rotor deviation angle reaches 6.27° in wet case and P b = 14.55 kPa.
Hamed Bagheri-Esfe; Mohammad Kermani; Majid Saffar-Avval. Effects of non-equilibrium condensation on deviation angle and efficiency in a steam turbine stage. Journal of Mechanical Science and Technology 2016, 30, 1351 -1361.
AMA StyleHamed Bagheri-Esfe, Mohammad Kermani, Majid Saffar-Avval. Effects of non-equilibrium condensation on deviation angle and efficiency in a steam turbine stage. Journal of Mechanical Science and Technology. 2016; 30 (3):1351-1361.
Chicago/Turabian StyleHamed Bagheri-Esfe; Mohammad Kermani; Majid Saffar-Avval. 2016. "Effects of non-equilibrium condensation on deviation angle and efficiency in a steam turbine stage." Journal of Mechanical Science and Technology 30, no. 3: 1351-1361.
Hamed Bagheri Esfe; Mohammad Kermani; Majid Saffar-Avval; University of Shahreza; Amirkabir University of Technology. Numerical Simulation of Compressible Two-Phase Condensing Flows. Journal of Applied Fluid Mechanics 2016, 9, 867 -876.
AMA StyleHamed Bagheri Esfe, Mohammad Kermani, Majid Saffar-Avval, University of Shahreza, Amirkabir University of Technology. Numerical Simulation of Compressible Two-Phase Condensing Flows. Journal of Applied Fluid Mechanics. 2016; 9 (2):867-876.
Chicago/Turabian StyleHamed Bagheri Esfe; Mohammad Kermani; Majid Saffar-Avval; University of Shahreza; Amirkabir University of Technology. 2016. "Numerical Simulation of Compressible Two-Phase Condensing Flows." Journal of Applied Fluid Mechanics 9, no. 2: 867-876.
Sabah Hamidi; Mohammad Kermani; sanandaj branch islamic azad university. Numerical Study of Water Production from Compressible Moist-Air Flow. Journal of Applied Fluid Mechanics 2016, 9, 333 -341.
AMA StyleSabah Hamidi, Mohammad Kermani, sanandaj branch islamic azad university. Numerical Study of Water Production from Compressible Moist-Air Flow. Journal of Applied Fluid Mechanics. 2016; 9 (1):333-341.
Chicago/Turabian StyleSabah Hamidi; Mohammad Kermani; sanandaj branch islamic azad university. 2016. "Numerical Study of Water Production from Compressible Moist-Air Flow." Journal of Applied Fluid Mechanics 9, no. 1: 333-341.
Hadi Heidary; Mohammad Kermani; Mohsen Pirmohammadi; Mapna Group; Amirkabir University of Technology; Unspecified. Partition Effect on Thermo Magnetic Natural Convection and Entropy Generation in Inclined Porous Cavity. Journal of Applied Fluid Mechanics 2016, 9, 119 -130.
AMA StyleHadi Heidary, Mohammad Kermani, Mohsen Pirmohammadi, Mapna Group, Amirkabir University of Technology, Unspecified. Partition Effect on Thermo Magnetic Natural Convection and Entropy Generation in Inclined Porous Cavity. Journal of Applied Fluid Mechanics. 2016; 9 (1):119-130.
Chicago/Turabian StyleHadi Heidary; Mohammad Kermani; Mohsen Pirmohammadi; Mapna Group; Amirkabir University of Technology; Unspecified. 2016. "Partition Effect on Thermo Magnetic Natural Convection and Entropy Generation in Inclined Porous Cavity." Journal of Applied Fluid Mechanics 9, no. 1: 119-130.
A three-dimensional, steady, single-phase flow of oxygen, nitrogen and water vapor mixture in the cathode of proton exchange membrane (PEM) fuel cell was numerically studied here. It was shown that the performance of the cell was enhanced by partial blockage of the flow channels in a parallel flow field. Since, channel indentation could increase oxygen content within the catalyst layer. It was observed that the influence of channel indentation in high current density regions was noticeable. Various types of blocks with profile shapes: square (SQ), semicircle (SC) and trapezoid (TR) were considered. Enhancements were compared with the no-dent (ND) called as the base case. The voltage to current relation was modeled using the Tafel equation. This provided the distribution of current density at a prescribed cell voltage. The computations were performed at 333 K, 100,000 Pa, water dew point temperature 313 K, and 50% utilization within the range of 0.2–0.8 V. It was predicted that the flow turns to be two-phase in high current density regions (say cell voltages less than 0.4 V). To push the condensate out of the flow field, adequate pressure gradient were required. This prerequisite was already taken into account in this study. A parametric study considering the influences of dent heights and arrangements, exchange current density, fluid viscous resistance and rib sizes were considered providing enhancements over 25% in the net power. The present study gives a very helpful guideline for flow field manufactures.
A. Ghanbarian; M.J. Kermani. Enhancement of PEM fuel cell performance by flow channel indentation. Energy Conversion and Management 2015, 110, 356 -366.
AMA StyleA. Ghanbarian, M.J. Kermani. Enhancement of PEM fuel cell performance by flow channel indentation. Energy Conversion and Management. 2015; 110 ():356-366.
Chicago/Turabian StyleA. Ghanbarian; M.J. Kermani. 2015. "Enhancement of PEM fuel cell performance by flow channel indentation." Energy Conversion and Management 110, no. : 356-366.