Fabrication of micro pin fins on inclined V-shaped microchannel walls via laser micromilling

doi:10.1007/s40436-021-00382-x

Advances in Manufacturing ›› 2022, Vol. 10 ›› Issue (2): 220-234.doi: 10.1007/s40436-021-00382-x

Fabrication of micro pin fins on inclined V-shaped microchannel walls via laser micromilling

Da-Xiang Deng¹, Jian Zheng¹, Xiao-Long Chen², Guang Pi², Yong-Heng Liu¹

1. School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Shenzhen 518055, Guangdong, People’s Republic of China;
2. Department of Mechanical and Electrical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China

收稿日期:2021-05-21 修回日期:2021-08-08 发布日期:2022-06-11
通讯作者: Da-Xiang Deng E-mail:dengdaxiang@hit.edu.cn
基金资助:
This study is financially supported under the Grants of the National Natural Science Foundation of China (Grant No. 51775464), and was partially supported by Basic research projects of Shenzhen Research & Development Fund (Grant No. JCYJ20200109112808109).

Fabrication of micro pin fins on inclined V-shaped microchannel walls via laser micromilling

Da-Xiang Deng¹, Jian Zheng¹, Xiao-Long Chen², Guang Pi², Yong-Heng Liu¹

1. School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Shenzhen 518055, Guangdong, People’s Republic of China;
2. Department of Mechanical and Electrical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China

Received:2021-05-21 Revised:2021-08-08 Published:2022-06-11
Contact: Da-Xiang Deng E-mail:dengdaxiang@hit.edu.cn
Supported by:
This study is financially supported under the Grants of the National Natural Science Foundation of China (Grant No. 51775464), and was partially supported by Basic research projects of Shenzhen Research & Development Fund (Grant No. JCYJ20200109112808109).

摘要/Abstract

摘要： A laser-micromilling process was developed for fabricating micro pin fins on inclined V-shaped microchannel walls for enhanced microchannel heat sinks. A pulsed nanosecond fiber laser was utilized. The feasibility and mechanism of the formation of micro pin fins on inclined microchannel walls were investigated for a wide range of processing parameters. The effects of the laser output power, scanning speed, and line spacing on the surface morphologies and geometric sizes of the micro-pin fins were comprehensively examined, together with the material removal mechanisms. Micro pin fins with acute cone tips were readily formed on the V-shaped microchannel walls via the piling of recast layers and the downflow of re-solidified materials in the laser-ablation process. The pin-fin height exhibited an increasing trend when the scanning speed increased from 100 mm/s to 300 mm/s, and it decreased continuously when the line spacing increased from 5 μm to 20 μm. The optimal processing parameters for preparing micro pin fins on V-shaped microchannels were found to be a laser output power of 21 W, scanning speed of 100–300 mm/s, and line spacing of 2–5 μm. Moreover, the V-shaped microchannels with micro pin fins induced a 7%–538% boiling heat-transfer enhancement over their counterpart without micro pin fins.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-021-00382-x

关键词: Laser micromilling, Micro pin fins, Microchannels, Inclined walls, Laser ablation

Abstract: A laser-micromilling process was developed for fabricating micro pin fins on inclined V-shaped microchannel walls for enhanced microchannel heat sinks. A pulsed nanosecond fiber laser was utilized. The feasibility and mechanism of the formation of micro pin fins on inclined microchannel walls were investigated for a wide range of processing parameters. The effects of the laser output power, scanning speed, and line spacing on the surface morphologies and geometric sizes of the micro-pin fins were comprehensively examined, together with the material removal mechanisms. Micro pin fins with acute cone tips were readily formed on the V-shaped microchannel walls via the piling of recast layers and the downflow of re-solidified materials in the laser-ablation process. The pin-fin height exhibited an increasing trend when the scanning speed increased from 100 mm/s to 300 mm/s, and it decreased continuously when the line spacing increased from 5 μm to 20 μm. The optimal processing parameters for preparing micro pin fins on V-shaped microchannels were found to be a laser output power of 21 W, scanning speed of 100–300 mm/s, and line spacing of 2–5 μm. Moreover, the V-shaped microchannels with micro pin fins induced a 7%–538% boiling heat-transfer enhancement over their counterpart without micro pin fins.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-021-00382-x

Key words: Laser micromilling, Micro pin fins, Microchannels, Inclined walls, Laser ablation

Da-Xiang Deng, Jian Zheng, Xiao-Long Chen, Guang Pi, Yong-Heng Liu. Fabrication of micro pin fins on inclined V-shaped microchannel walls via laser micromilling[J]. Advances in Manufacturing, 2022, 10(2): 220-234.

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Fabrication of micro pin fins on inclined V-shaped microchannel walls via laser micromilling

Fabrication of micro pin fins on inclined V-shaped microchannel walls via laser micromilling

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