Experimental study on thermal performance of high power flat heat pipe

doi:10.11949/0438-1157.20221300

Abstract

Abstract:

A novel copper-water flat heat pipe with porous metal-foam wicks has been conducted to study its heat transfer characteristics working in high heat flux and anti-gravity conditions. The effects of inclination angle, filling ratio and heat loads on the heat transfer characteristic of flat heat pipe, including its thermal response performance and thermal resistance, were investigated experimentally. The results showed that the flat heat pipe has a favorable thermal response performance. It can reach a stable state within 60 s. The thermal resistance of flat heat pipe decreases first and then increases with increase of filling ratio, and flat heat pipe with a filling ratio of 20% has the best performance. Inclination angle has a significant effect on thermal performance. Under the premise that the maximum temperature is within 90℃, flat heat pipe can dissipate 300 W with a thermal resistance of 0.0109 K/W. Besides, compared with the heat pipes reported in the literatures, this flat heat pipe not only obtains a lower thermal resistance, but also achieves effective heat conduction with higher heat flux. These results are of great significance to the design of advanced flat heat pipes.

Key words: flat heat pipe, high heat flux, thermal resistance, anti-gravity, heat transfer, porous media, heat conduction

摘要：

为探究平板热管在高热通量和逆重力环境中的传热特性，设计并制作了一种具有泡沫金属结构的铜-水平板热管，系统地研究了不同放置方式、充液率和热功率对平板热管热响应特性和热阻的影响。实验结果表明：平板热管可实现快速启动，60 s内达到稳定，随着充液率增加，热管热阻先降低后升高，充液率为20%时性能最佳，放置方式对热管性能影响明显，顺重力性能最佳，在300 W时得到最小热阻为0.0109 K/W。相较于文献中的热管，此热管不仅获得了更低的热阻值，亦可实现更高热通量的有效导热。

关键词: 平板热管, 高热通量, 热阻, 逆重力, 传热, 多孔介质, 热传导

CLC Number:

TK 172.4

Huizhu YANG, Jingling LAN, Yue YANG, Jialin LIANG, Chuanwen LYU, Yonggang ZHU. Experimental study on thermal performance of high power flat heat pipe[J]. CIESC Journal, 2023, 74(4): 1561-1569.

杨辉著, 兰精灵, 杨月, 梁嘉林, 吕传文, 朱永刚. 高功率平板热管传热性能的实验研究[J]. 化工学报, 2023, 74(4): 1561-1569.

Figures/Tables 10

Fig.1 Heat pipe structure and temperature measurement point allocation

Table 1 Parameters of heat pipe

参数	数值
热管外尺寸长度/mm	156
热管外尺寸宽度/mm	36
上管壳厚度/mm	1.5
下管壳厚度/mm	1
空腔厚度/mm	5
吸液芯厚度/mm	0.5
放置方向	顺重力、水平、逆重力
充液率/%	5、10、20、30
加热功率/ W	10~300

Fig.2 SEM images of the wick before and after nanocoating

Fig.3 Schematic diagram of the experimental rig

Fig.4 Surface temperature distributions of flat heat pipe during starting up

Fig.5 Variation of startup temperature over time for the heat pipe at 280 W

Fig.6 The relationship between thermal resistance and heating power at different filling ratios

Fig.7 Temperature difference as a function of input power at different orientations

Fig.8 The relationship between thermal resistance and heating power at different oritentation

Fig.9 Comparison of the thermal resistance of heat pipe between this work and the reported in the literatures

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