Numerical simulation of convective heat transfer performance of bifurcated microchannel heat sink

doi:10.7523/j.ucas.2024.071

Abstract

Abstract: Inspired by the natural bifurcation structure such as blade veins, this paper uses numerical simulation to study the convective heat transfer of the basic unit of the bifurcated microchannel heat sink. On the basis of fixing the parameters of the first stage channel, changing the width of the second stage channel of the bifurcated structure, and analyzing the temperature field and flow field in the channel in detail. The pressure drop, convective heat transfer coefficient and comprehensive heat transfer evaluation coefficient from the inlet to the second stage were obtained. The results show that the bifurcation structure can enhance the fluid disturbance, interrupt and form a new fluid boundary layer, strengthen the heat transfer and make the temperature distribution more uniform. Within 1mm of the second stage, the inlet effect of internal flow is more influential, and the comprehensive heat transfer evaluation coefficient is the largest when the ratio of hydraulic diameter after bifurcation to hydraulic diameter before bifurcation is 0.54. When the ratio of hydraulic diameter after bifurcation to hydraulic diameter before bifurcation is 0.80, the comprehensive heat transfer evaluation coefficient is the largest outside the second stage channel 1mm. The research can be used as reference and guidance for the optimal design of bifurcated microchannel heat sinks.

Key words: microchannel heat sink, enhance heat transfer, bifurcated structure, fractal

CLC Number:

TK124

KE Weixuan, MU Jianchao, WANG hao, CAI kemeng, LIU Jie. Numerical simulation of convective heat transfer performance of bifurcated microchannel heat sink[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2024.071.

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