歧管式全金刚石微通道表面终端及换热性能

doi:10.13251/j.issn.0254-6051.2023.10.007

金属热处理 ›› 2023, Vol. 48 ›› Issue (10): 50-58.DOI: 10.13251/j.issn.0254-6051.2023.10.007

歧管式全金刚石微通道表面终端及换热性能

冯旭瑞¹, 韦欣怡¹, 张建军¹, 郑宇亭^1,2, 陈良贤¹, 刘金龙¹, 李成明^1,2, 魏俊俊^1,2

1.北京科技大学新材料技术研究院, 北京 100083;
2.北京科技大学顺德创新学院, 广东佛山 528399

收稿日期:2023-06-28 修回日期:2023-08-22 出版日期:2023-10-25 发布日期:2023-12-07
通讯作者: 魏俊俊,教授,博士,E-mail:weijj@ustb.edu.cn
作者简介:冯旭瑞(1993—),男,博士研究生,主要研究方向为碳纳米管/金刚石界面,E-mail: xrfeng162@163.com。
基金资助:
国家自然科学基金(52172037);北京市自然科学基金(2212036);佛山市科技创新专项(BK22BE006,BK21BE004)

Microchannel surface terminal and heat transfer performance of manifold all-diamond

Feng Xurui¹, Wei Xinyi¹, Zhang Jianjun¹, Zheng Yuting^1,2, Chen Liangxian¹, Liu Jinlong¹, Li Chengming^1,2, Wei Junjun^1,2

1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;
2. Shunde Graduate School, University of Science and Technology Beijing, Foshan Guangdong 528399, China

Received:2023-06-28 Revised:2023-08-22 Online:2023-10-25 Published:2023-12-07

摘要/Abstract

摘要： 采用直流电弧等离子体喷射装置沉积金刚石膜,利用高能激光将其加工成Z型歧管式全金刚石微通道,对微通道进行氢等离子体处理、酸处理和氟等离子体处理后获得氢终端、氧终端和氟终端。通过搭建泵驱两相流体测试平台开展金刚石微通道换热性能测试。研究发现,在恒定热流处理过程中,随运行时间增加,氢终端歧管式全金刚石微通道疏水性能快速降低;氧终端的亲水性能降低后趋于稳定;氟终端表面最为稳定,其疏水特性经初期轻微降低后保持恒定。同时,发现氧终端和氟终端的歧管式全金刚石微通道对沸腾初期换热以核态沸腾为主导,其核态为泡状流和弹状流。继续加热,大量气泡汇聚形成环形流,此时薄膜蒸发成为主导机制。疏水性的氟终端微通道会加速气泡成核,在流动沸腾状态下传热性能要大于氟终端。气泡过度的形成造成逆流的发生,氧终端微通道可以延缓逆流的发生,表现出更高的沸腾起始点和临界热流密度。而在沸腾状态氟终端微通道的传热系数高于氧终端,氟终端为更加适合的制备疏水性金刚石热沉的表面改性技术。

关键词: 歧管式, 全金刚石微通道, 终端稳定性, 换热性能

Abstract: Diamond thick film was prepared by DC arc plasma spraying, and Z-type manifold-type all-diamond microchannel was formed by high-energy laser. The diamond microchannel was treated with hydrogen plasma, acid and fluorine plasma to obtain hydrogen-terminal, oxygen-terminal and fluorine-terminal. Through the two-phase heat transfer experiment, the change mechanism of the surface modification technology in the sustained stability of the diamond microchannel radiator was analyzed. The researches find that in the process of constant heat flow treatment, with the increase of operating time, the hydrophobic properties of the hydrogen-terminated diamond microchannels decrease rapidly and are not suitable for heat transfer research. The hydrophilic properties of the oxygen terminal decrease significantly and then tend to be stable. The fluorine-terminated surface is the most stable, and its hydrophobicity remains constant after a slight decrease in the initial stage. At the same time, it is found that the heat transfer of the oxygen terminal and fluorine terminal manifold diamond microchannels is dominated by nuclear boiling, including bubble flow and elastic flow. After further heating, a large number of bubbles converge to form annular flow, and the evaporation of thin film is the dominant mechanism. The hydrophobic fluorine terminal microchannel will accelerate the nucleation of bubbles, and the heat transfer performance is better than that of fluorine terminal in flow boiling state. The excessive bubble formation causes the occurrence of reverse flow, and the oxygen terminal microchannel can delay the occurrence of reverse flow, showing a higher boiling starting point and critical heat flux. The heat transfer coefficient of the fluorine terminal microchannel is higher than that of the oxygen terminal in boiling state, so the fluorine terminal can be more suitable for the surface modification technology of preparing hydrophobic diamond heat sink.

Key words: manifold type, all-diamond microchannel, terminal stability, heat transfer performance

中图分类号:

TG156.6

冯旭瑞, 韦欣怡, 张建军, 郑宇亭, 陈良贤, 刘金龙, 李成明, 魏俊俊. 歧管式全金刚石微通道表面终端及换热性能[J]. 金属热处理, 2023, 48(10): 50-58.

Feng Xurui, Wei Xinyi, Zhang Jianjun, Zheng Yuting, Chen Liangxian, Liu Jinlong, Li Chengming, Wei Junjun. Microchannel surface terminal and heat transfer performance of manifold all-diamond[J]. Heat Treatment of Metals, 2023, 48(10): 50-58.

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歧管式全金刚石微通道表面终端及换热性能

Microchannel surface terminal and heat transfer performance of manifold all-diamond

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