Hydrothermal and entropy generation specifications of a hybrid ferronanofluid in microchannel heat sink embedded in CPUs

doi:10.1016/j.cjche.2020.08.053

Abstract

Abstract: The objective of this numerical work is to evaluate the first law and second law performances of a hybrid nanofluid flowing through a liquid-cooled microchannel heatsink. The water-based hybrid nanofluid includes the Fe₃O₄ and carbon nanotubes (CNTs) nanoparticles. The heatsink includes a microchannel configuration for the flow field to gain heat from a processor placed on the bottom of the heatsink. The effects of Fe₃O₄ concentration (φ_Fe₃O₄), CNT concentration (φ_CNT) and Reynolds number (Re) on the convective heat transfer coefficient, CPU surface temperature, thermal resistance, pumping power, as well as the rate of entropy generation due to the heat transfer and fluid friction is examined. The results indicated higher values of convective heat transfer coefficient, pumping power, and frictional entropy generation rate for higher values of Re, φ_Fe₃O₄ and φ_CNT. By increasing Re, φ_Fe₃O₄ and φ_CNT, the CPU surface temperature and the thermal resistance decrease, and the temperature distribution at the CPU surface became more uniform. To achieve the maximum performance of the studied heatsink, applying the hybrid nanofluid with low φ_Fe₃O₄ and φ_CNT was suggested, while the minimum entropy generation was achieved with the application of nanofluid with high φ_Fe₃O₄ and φ_CNT.

Key words: Liquid-cooled heatsink, Hydrothermal aspects, Irreversibility, Hybrid nanofluid, Carbon nanotube, Fe₃O₄

摘要： The objective of this numerical work is to evaluate the first law and second law performances of a hybrid nanofluid flowing through a liquid-cooled microchannel heatsink. The water-based hybrid nanofluid includes the Fe₃O₄ and carbon nanotubes (CNTs) nanoparticles. The heatsink includes a microchannel configuration for the flow field to gain heat from a processor placed on the bottom of the heatsink. The effects of Fe₃O₄ concentration (φ_Fe₃O₄), CNT concentration (φ_CNT) and Reynolds number (Re) on the convective heat transfer coefficient, CPU surface temperature, thermal resistance, pumping power, as well as the rate of entropy generation due to the heat transfer and fluid friction is examined. The results indicated higher values of convective heat transfer coefficient, pumping power, and frictional entropy generation rate for higher values of Re, φ_Fe₃O₄ and φ_CNT. By increasing Re, φ_Fe₃O₄ and φ_CNT, the CPU surface temperature and the thermal resistance decrease, and the temperature distribution at the CPU surface became more uniform. To achieve the maximum performance of the studied heatsink, applying the hybrid nanofluid with low φ_Fe₃O₄ and φ_CNT was suggested, while the minimum entropy generation was achieved with the application of nanofluid with high φ_Fe₃O₄ and φ_CNT.

关键词: Liquid-cooled heatsink, Hydrothermal aspects, Irreversibility, Hybrid nanofluid, Carbon nanotube, Fe₃O₄

Amin Shahsavar, Majid Jafari, Pouyan Talebizadehsardari, Davood Toghraie. Hydrothermal and entropy generation specifications of a hybrid ferronanofluid in microchannel heat sink embedded in CPUs[J]. Chinese Journal of Chemical Engineering, 2021, 32(4): 27-38.

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