Browsing by Author "Hamedi, Sajad"

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Citation Count: 0
Performance of proton exchange membrane fuel cell system by considering the effects of the gas diffusion layer thickness, catalyst layer thickness, and operating temperature of the cell
(Elsevier, 2024) Hamedi, Sajad; Salahshour, Soheıl; Al-Zahiwat, Murtadha M.; AL-Hamairy, Ahmed Khudhair; Jasim, Dheyaa J.; Salahshour, Soheil; Esmaeili, Sh
Background: In this research, the effect of anode and cathode channel cross-sectional shape on the performance of PEM fuel cell was investigated and the appropriate length and dimensions of the channel were determined. Finally, for the determined geometric conditions, the cell performance at different voltages was investigated. Methods: The purpose of this study was to investigate the structural characteristics of the fuel cell on its performance. The results show that the pressure and temperature in the catalyst layer (CL) of the cathode side are greater than the anode, and the temperature in the central regions of the catalyst layer is higher than the lateral regions. Also, the channel with a length of 100 mm is optimal in terms of producing the maximum current density and the amount of pressure drop is much lower than the channel with a length of 150 mm, which reduces the power consumption of the cell. Significant findings: In general, a higher electric current is produced by increasing the thickness of the gas diffusion layer (GDL) and the catalyst layer. At a voltage of 0.8 V, with increasing thickness from 0.25 mm to 0.5 mm, the current density increases above 6 %. The percentage increase in current density at 60 degrees C-80 - 80 degrees C for 0.85 V and 0.75 V voltages is 42.1 % and 9.28 %, respectively.
Citation Count: 1
Thermal performance of forced convection of water- NEPCM nanofluid over a semi-cylinder heat source
(Elsevier, 2024) Wang, Xiaoming; Salahshour, Soheıl; Keivani, Babak; Jasim, Dheyaa J.; Sultan, Abbas J.; Hamedi, Sajad; Toghraie, Davood
1) Background: Phase change materials (PCMs) have been used statically, which has caused the use of these materials to face challenges. Encapsulating PCMs and combining them with the base fluid can significantly solve the problem of using PCMs in BTM systems. In the present study, based on computational fluid dynamics, forced convection heat transfer of nano -encapsulated phase change materials (NEPCM) in a BTM system are simulated. The main aim of the present research is to reduce the temperature at the surface of the hot cylinder. 2) Methods: In this research, we simulated lithium battery thermal management systems in both steady and transient states. The effects of using NEPCM particles to water were investigated. Modeling is implemented using the finite volume method and the PIMPLE and SIMPLE algorithms in OpenFoam. Furthermore, the effects of battery heat flux, Reynolds number, and the presence of nanoparticles (NPs) were analyzed. We intend to evaluate the optimal state of the system by studying the mentioned parameters. 3) Significant Findings: Our study shows that adding 3.5% NEPCM to water can reduce the length of the vortex by 22% and in unsteady -state simulation, it is observed that the presence of NEPCM particles in water reduces battery temperature up to 0.66 K.