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Numerical Analysis of Fluid Flow and Heat Transfer in Micro-Channel Heat Sinks with Double-Layered Complex Structure

1
School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin 150001, China
2
College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
3
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Micromachines 2020, 11(2), 146; https://doi.org/10.3390/mi11020146
Received: 2 December 2019 / Revised: 16 January 2020 / Accepted: 17 January 2020 / Published: 29 January 2020
Micro-channel heat sink (MCHS) has been extensively used in various electronic cooling fields. Double-layered MCHS, or DL-MCHS, is regarded as one effective technique for high-heat-flux transfer and is expected to meet the ever-increasing heat load requirement of future electronic device generations. In order to improve the cooling capacity, two new types of the MCHS, with a double-layered matrix structure (DL-M) and double-layered interlinked matrix structure (DL-IM) are proposed and investigated numerically. The two designs are compared with the traditional double-layered rectangular structure (DL-R) and the double-layered triangular structure (DL-T). Different properties of the heat sink are investigated to assess the overall heat transfer performance, for which coolant flow and heat transfer are both evaluated. The numerical results reveal that the periodical slot subchannel in the matrix has a significant effect on fluid flow for heat transfer. In comparison to the DL-R and the DL-T, the DL-M and DL-IM realize a much lower pressure drop and temperature rise at the base surface and also have higher Nusselt number and secondary flow intensity, therefore, manifesting better overall thermal performance. In the DL-M and DL-IM, the coolant flows along the periodical subchannel in one layer and is redirected into the second layer with vortices being induced. The vortices promote the coolant mixing and enhance the mass and heat transfer. These geometric design strategies can provide references for wide heat sink applications. View Full-Text
Keywords: microchannel heat sink; heat transfer enhancement; secondary flow microchannel heat sink; heat transfer enhancement; secondary flow
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MDPI and ACS Style

Liu, X.; Zhang, M.; Wang, Z.; Chen, J.; Sun, H.; Sun, H. Numerical Analysis of Fluid Flow and Heat Transfer in Micro-Channel Heat Sinks with Double-Layered Complex Structure. Micromachines 2020, 11, 146.

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