Abstract
A numerical study was conducted to investigate the mechanism of laminar flow and heat transfer enhancement in an interrupted microchannel heat sink (IMCHS) with different shaped ribs at Reynolds number ranging from 100 to 900. The global flow features, heat transfer and friction for IMCHS with no ribs, rectangle ribs, triangle ribs and trapezoid ribs are detailed compared. The results show that the local heat transfer and friction performance of IMCHS with ribs show significant increase at the windward side of the ribs. Additionally, the smaller the chamfer of ribs, the larger average heat transfer and friction performance. For IMCHS with rectangle ribs, the maximum increment of Nu and f can reach to 1.81 and 2.59, respectively. Concerning the overall heat transfer performance (PEC), the trapezoid ribs show the best behavior with PEC = 1.65–1.38 at Re = 100–900.
Highlights
With the development of the electronics industry, the power of electronic components has gradually increased
In order to test the accuracy of the numerical method, the simulation results are compared with the experimental data [16] in an interrupted microchannel heat sink with rectangular ribs in transverse microchambers, with width ratio and length ratio both equal to 0.5
It can be seen that the velocity contours of interrupted microchannel heat sink (IMCHS)-no ribs (NR) show a big low-speed region at the microchambers which is useless for improvement in heat transfer [24]
Summary
With the development of the electronics industry, the power of electronic components has gradually increased. More effective heat dissipation methods were urgently needed. Various kinds of enhanced heat sinks have been studied recently such as radial heat sink with fins used on high-power LED lightings [1], cooling of electronics using phase change material [2] and nanofluids [3,4,5]-based heat. 1 3 Vol.:(0123456789) B-B Y A-A Z. X (a) Schematic diagram (c) A-A direction. Heat flux (b) Computational domain 1 mm 0.5 mm. 0.2 mm 0.3 mm 0.1 mm 0.05 mm sinks, water-cooling in smooth microchannel heat sinks with obstructions [6]
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