Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 45, Issue 6, Pages 9449-9462Publisher
WILEY
DOI: 10.1002/er.6473
Keywords
discontinuous finite element method; entropy generation; heat sinks; thermal performance; Y-shaped bionic microchannel
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Funding
- Aviation Science Foundation of China [2017ZA53001]
- Ministry of Science and Technology, Taiwan [108-2221-E-009-037 -MY3]
- National 111 Project [B18041]
- Major Program of the Nature Science Foundation of Shandong Province [ZR2019ZD11]
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This study introduces a Y-shaped bionic microchannel (YBMC) heat sink designed based on bionic concept and constructal law, which achieves better thermal performance and lower total pressure drop through the optimization of geometric parameters. The YBMC design provides a more uniform temperature distribution along the heated surface and exhibits a lower degree of irreversible loss compared to rectangular cases.
A kind of Y-shaped bionic microchannel (YBMC) heat sink is proposed and designed based on bionic concept and constructal law. A discontinuous Galerkin finite element method is applied to solve incompressible steady laminar flow and heat transfer in microchannels, and an optimal design strategy for geometrical parameters of the double-layer microchannels with counterflow arrangement is adopted. Results reveal that the proposed YBMC configuration provides much better thermal performance and lower total pressure drop subject to the same mass flow rate when compared to microchannels with rectangular straight configuration. Yet the YBMC design offers a more uniform temperature distribution along the heated surface. By using the principle of entropy generation, the degree of irreversible loss of the Y-shaped bionic cases is much less than those of the rectangular case. The pressure rises at the bifurcations of the first-stage, and the second-stage is related to the restart of boundary layer, confirming that the YBMC exhibits high thermal performance.
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