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Micromachines
Volume 16
Issue 5
10.3390/mi16050533
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Article

Heat Transfer Enhancement of Diamond Rib Mounted in Periodic Merging Chambers of Micro Channel Heat Sink

by
Xin Lu
1,2,
Lu Wang
1,2,
Liangbi Wang
1,2,* and
Yao Hu
1
1
School of Mechanical and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2
Key Laboratory of Railway Vehicle Thermal Engineering Ministry of Education, Lanzhou Jiaotong University, Lanzhou 730070, China
*
Author to whom correspondence should be addressed.
Micromachines 2025, 16(5), 533; https://doi.org/10.3390/mi16050533
Submission received: 28 March 2025 / Revised: 22 April 2025 / Accepted: 27 April 2025 / Published: 29 April 2025
(This article belongs to the Section E: Engineering and Technology)
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Abstract

The heat transfer enhancement of diamond-shaped ribs mounted in the periodic merging chambers of microchannel (MC) heat sinks is investigated using a numerical method for Reynolds number in the region of 300–700. Compared to triangular, rectangular, and cylindrical ribs, diamond-shaped ribs achieve 3.59%, 13.24%, and 6.34% higher enhancement effects, respectively, under the same mass flow rate. Further analysis of geometric parameters (length, width, and height) and rib positioning reveals that a rib height of h/Hch = 0.8 provides optimal heat dissipation performance. For Re < 500, the optimal configuration is a rib length of l/Lmerg = 0.55 and a width of b/Wch = 0.8, while for 500 < Re < 700, it shifts to l/Lmerg = 0.36 and b/Wch = 1.6. For s/Lmerg, the smaller it is, the shorter the main flow separation time, thereby improving heat transfer efficiency.
Keywords: micro channel heat sink; merging chambers; ribs; geometric parameter; heat transfer micro channel heat sink; merging chambers; ribs; geometric parameter; heat transfer

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MDPI and ACS Style

Lu, X.; Wang, L.; Wang, L.; Hu, Y. Heat Transfer Enhancement of Diamond Rib Mounted in Periodic Merging Chambers of Micro Channel Heat Sink. Micromachines 2025, 16, 533. https://doi.org/10.3390/mi16050533

AMA Style

Lu X, Wang L, Wang L, Hu Y. Heat Transfer Enhancement of Diamond Rib Mounted in Periodic Merging Chambers of Micro Channel Heat Sink. Micromachines. 2025; 16(5):533. https://doi.org/10.3390/mi16050533

Chicago/Turabian Style

Lu, Xin, Lu Wang, Liangbi Wang, and Yao Hu. 2025. "Heat Transfer Enhancement of Diamond Rib Mounted in Periodic Merging Chambers of Micro Channel Heat Sink" Micromachines 16, no. 5: 533. https://doi.org/10.3390/mi16050533

APA Style

Lu, X., Wang, L., Wang, L., & Hu, Y. (2025). Heat Transfer Enhancement of Diamond Rib Mounted in Periodic Merging Chambers of Micro Channel Heat Sink. Micromachines, 16(5), 533. https://doi.org/10.3390/mi16050533

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