Journal of University of Chinese Academy of Sciences >
Numerical simulation of convective heat transfer performance of bifurcated microchannel heat sink
Received date: 2024-07-26
Revised date: 2024-09-02
Online published: 2024-09-24
Inspired by the natural bifurcation structure such as leaf 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 1 mm of the inlet of the second-stage-channel diameter， the inlet effect of internal flow is more influential， and the comprehensive heat transfer evaluation coefficient reaches its maximum when the ratio of hydraulic diameter after bifurcation to that before bifurcation is 0.54. When the ratio of hydraulic diameter bifurcation is 0.80， the comprehensive heat transfer evaluation coefficient reaches its maximum outside the second-stage-channel above 1 mm. The research can be used as a reference and guidance for the optimal design of bifurcated microchannel heat sinks.
Weixuan KE , Jianchao MU , Hao WANG , Kemeng CAI , Jie LIU . Numerical simulation of convective heat transfer performance of bifurcated microchannel heat sink[J]. Journal of University of Chinese Academy of Sciences, 2026 , 43(4) : 478 -487 . DOI: 10.7523/j.ucas.2024.071
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