超亲水毛细芯环路热管启动及热性能分析

doi:10.16085/j.issn.1000-6613.2019-1169

摘要/Abstract

摘要：

为解决电子设备高热通量下的散热问题，采用H₂O₂氧化法对烧结毛细芯进行了超亲水改性，研究了毛细芯表面润湿性对吸液性能的影响。并将改性后的超亲水毛细芯应用到环路热管内，研究了倾斜角度及加热功率对超亲水毛细芯环路热管的换热特性的影响。实验结果表明：超亲水毛细芯的吸液速度增加，吸液时间较亲水毛细芯减小了3.52ms；与普通亲水毛细芯环路热管相比，在加热功率Q=200W时，超亲水毛细芯环路热管蒸发器中心温度降低了约6.0℃，在Q=20W时启动时间与温度分别降低了33s与2.5℃。同时发现超亲水毛细芯环路热管在正重力状态时的运行温度更低，热阻较小，最低热阻仅为0.084℃/W。

关键词: 环路热管, 毛细芯, 纳米结构, 超亲水, 启动, 相变, 传热

Abstract:

To solve the problem of high heat flux heat dissipation of electronic equipment, the sintered porous wicks surface was modified by H₂O₂. The influence of porous wick surface wettability on liquid absorption performance was studied. The super-hydrophilic porous wicks were applied to loop heat pipe. A series of experiments were performed to study the effects of various parameters including tilt angles and heating power. The experimental results showed that the absorption rate of the porous wick was increased after surface wettability treatment, and the super-hydrophilic porous wick suction time was reduced by 3.52ms. Compared with the conventional hydrophilic porous wick loop heat pipe, the evaporator central temperature of super-hydrophilic porous wick loop heat pipe was reduced by about 6.0℃ at 200W. The start-up time and temperature were reduced by 33s and 2.5℃ at Q=20W, respectively. At the same time, it was found that the super-hydrophilic porous wick loop heat pipe has lower operating temperature at the gravity situation, and the thermal resistance was 0.084℃/W.

Key words: loop heat pipe, porous wick, nanostructure, super-hydrophilic, start-up, phase change, heat transfer

中图分类号:

TK124

郭浩,纪献兵,周儒鸿,彭家略,徐进良. 超亲水毛细芯环路热管启动及热性能分析[J]. 化工进展, 2020, 39(4): 1227-1234.

Hao GUO,Xianbing JI,Ruhong ZHOU,Jialüe PENG,Jinliang XU. Analysis of start-up and thermal performance of super-hydrophilic porous wick loop heat pipe[J]. Chemical Industry and Engineering Progress, 2020, 39(4): 1227-1234.

图/表 7

图1 实验系统

图2 毛细芯电镜图

图3 液滴吸收曲线

图4 毛细芯润湿性对Tc的影响

图5 热管启动曲线

（Q=20W，θ=0°）

图6 倾斜角度对Tc的影响

图7 传热系数及热阻变化曲线

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