Boiling heat transfer performance on multiscale structure sintered groove surface

doi:10.16085/j.issn.1000-6613.2024-0200

Abstract

Abstract:

To solve the heat dissipation problem of high heat flux electronic components, multiscale structured groove surfaces were prepared by sintering copper powder with different particle diameters. Combining visualization, the effect of multiscale structure on liquid replenishment and bubble escape was studied using FCM-47 electronic fluoride solution as the working fluid. Exploring the effects of copper powder particle diameter and groove structure size on bubble generation, growth, detachment, and boiling heat transfer, The results showed that the size of the groove structure had a significant impact on boiling heat transfer performance, with the valley width affecting the bubble detachment diameter, and there was an optimal width value. The influence of ridge height and groove bottom thickness was the result of a balance between the number of nucleation points that the groove could provide, the area of phase change heat transfer, and the vapor-liquid flow resistance. Both theoretical analysis of pores and visualization of boiling indicated that multiscale structures were beneficial for boiling heat transfer. Compared to spherical copper powder, branched copper powder formed multiscale structural channels with different pore sizes after sintering, which effectively met the different needs of liquid replenishment and bubble escaping, and significantly improved heat transfer performance. The branched copper powder multiscale surface with particle diameter of 150μm was significantly better than other surfaces in the present experiment, and heat transfer coefficient in electronic fluorinated liquid could reached 46.0kW/(m²·K).

Key words: multiscale, sintering, groove structure, pool boiling, visualization, heat transfer, phase change

摘要：

为解决高热流密度电子元件的散热问题，本文采用不同粒径的铜粉烧结制备了多尺度结构沟槽表面，以FCM-47电子氟化液为工质，结合可视化，研究了多尺度结构对液体补充与汽泡逸出的作用，探寻了铜粉粒径与沟槽结构尺寸对汽泡产生、长大、脱离及沸腾传热的影响。结果表明沟槽结构尺寸对沸腾换热有着显著的影响，其中谷部宽度影响着汽泡脱离直径，存在最佳宽度值，脊部高度及沟槽底层厚度的影响是沟槽所能提供的核化点数量、相变传热面积及汽液流动阻力平衡的结果。孔隙的理论分析和沸腾可视化均表明多尺度结构有利于沸腾换热。相较于球状铜粉，枝状铜粉在烧结后形成了具有大小孔径的多尺度结构通道，很好地兼顾了液体补充与汽泡逸出的不同需求，传热性能得到显著提升。其中粒径为150μm的枝状铜粉多尺度表面传热性能显著优于本实验范围内其他表面，在电子氟化液中的换热系数可达46.0kW/(m²·K)。

关键词: 多尺度, 烧结, 沟槽结构, 池沸腾, 可视化, 传热, 相变

CLC Number:

TK124

ZHANG Zhe, JI Xianbing, YANG Yuhao, LIU Jiaxuan, YAO Bocheng. Boiling heat transfer performance on multiscale structure sintered groove surface[J]. Chemical Industry and Engineering Progress, 2025, 44(2): 669-676.

张喆, 纪献兵, 杨聿昊, 刘家璇, 姚泊丞. 多尺度结构烧结沟槽表面沸腾传热性能[J]. 化工进展, 2025, 44(2): 669-676.

Figures/Tables 8

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