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

Document Type : Research Article

Authors

1 Faculty of Mechanical Engineering and the Energy Research Institute, University of Kashan, Kashan, Iran

2 Fluid and Thermal, Faculty of Meh. Eng., University of Kashan

3 Professor Sharif University of Technology Department of Mechanical Engineering

Abstract

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.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 1 (Special Issue)
April 2021
Pages 517-538

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