Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 53 Issue 1 (Special Issue) 2021 03 21 Numerical Simulation of Magnetic Field Effect on Thermal and Thermo-Hydraulic Performance and Entropy Generation of a Silicon Microchannel Heat Sink Under Uniform Heat Flux Numerical Simulation of Magnetic Field Effect on Thermal and Thermo-Hydraulic Performance and Entropy Generation of a Silicon Microchannel Heat Sink Under Uniform Heat Flux 517 538 3676 10.22060/mej.2019.16269.6316 FA Mojtaba Sepehrnia Faculty of Mechanical Engineering and the Energy Research Institute, University of Kashan, Kashan, Iran Hossein Khorasanizadeh Fluid and Thermal, Faculty of Meh. Eng., University of Kashan Mohammad Behshad Shafiei Professor Sharif University of Technology Department of Mechanical Engineering Journal Article 2019 05 07 In this three-dimensional numerical study, the effects of uniform magnetic field on the thermal and thermo-hydraulic performance and entropy generation of water flow through a trapezoidal heat sink, with four different inlet/outlet configurations, have been investigated. An electronic chip embedded on the base plate of the heat sink generates uniform heat flux of 50 kW/m². Simulations have been performed for mass flow rates of 0.02, 0.03, 0.04 and 0.05 g/sec and Hartmann numbers of 0, 2, 4, 8 and 16. The results show that in overall the best configuration is the A-type arrangement, in which the flow enters the center of the distributing chamber and exits from the center of the collecting chamber. For this arrangement and a constant mass flow rate, with increasing Hartmann number from 0 to 16, thermal resistance reduces between 4.39% and 9.15%, theta between 1.81% and 7.91% and performance evaluation criterion between 81.61% and 87.15%, but total entropy generation increases between 10.13% and 77.07%. For the best arrangement, the best thermal performance occurs for the mass flow rate of 0.05g/sec and Hartmann number of 16 and the best thermo-hydraulic and entropy generation performances occur for the mass flow rate of 0.02 g/sec and Hartmann number of zero. In this three-dimensional numerical study, the effects of uniform magnetic field on the thermal and thermo-hydraulic performance and entropy generation of water flow through a trapezoidal heat sink, with four different inlet/outlet configurations, have been investigated. An electronic chip embedded on the base plate of the heat sink generates uniform heat flux of 50 kW/m². Simulations have been performed for mass flow rates of 0.02, 0.03, 0.04 and 0.05 g/sec and Hartmann numbers of 0, 2, 4, 8 and 16. The results show that in overall the best configuration is the A-type arrangement, in which the flow enters the center of the distributing chamber and exits from the center of the collecting chamber. For this arrangement and a constant mass flow rate, with increasing Hartmann number from 0 to 16, thermal resistance reduces between 4.39% and 9.15%, theta between 1.81% and 7.91% and performance evaluation criterion between 81.61% and 87.15%, but total entropy generation increases between 10.13% and 77.07%. For the best arrangement, the best thermal performance occurs for the mass flow rate of 0.05g/sec and Hartmann number of 16 and the best thermo-hydraulic and entropy generation performances occur for the mass flow rate of 0.02 g/sec and Hartmann number of zero. https://mej.aut.ac.ir/article_3676_eb96516504e99c598679dd9c4df9472e.pdf