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Journal of Thermal Science

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2023 , Vol. 32 >Issue 1: 183 - 191

DOI: https://doi.org/10.1007/s11630-022-1756-9

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Evaporating Temperature Uniformity of the Pulsating Heat Pipe with Surfactant Solutions at Different Concentrations

  • BAO Kangli ,
  • WANG Xuehui ,
  • ZHANG Peng-E ,
  • HAN Xiaohong ,
  • TAN Jianming
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  • 1. State Key Laboratory of Air-Conditioning Equipment and System Energy Conservation, GREE Electric Appliances Inc. of Zhuhai, Zhuhai 519070, China
    2. Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China

网络出版日期: 2023-11-28

基金资助

This work has been supported by State Key Laboratory of Air-Conditioning Equipment and System Energy Conservation (No. ACSKL2019KT08) and Natural Science Foundation of Zhejiang Province (No. LZ19E060001).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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Evaporating Temperature Uniformity of the Pulsating Heat Pipe with Surfactant Solutions at Different Concentrations

  • BAO Kangli ,
  • WANG Xuehui ,
  • ZHANG Peng-E ,
  • HAN Xiaohong ,
  • TAN Jianming
Expand
  • 1. State Key Laboratory of Air-Conditioning Equipment and System Energy Conservation, GREE Electric Appliances Inc. of Zhuhai, Zhuhai 519070, China
    2. Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China

Online published: 2023-11-28

Supported by

This work has been supported by State Key Laboratory of Air-Conditioning Equipment and System Energy Conservation (No. ACSKL2019KT08) and Natural Science Foundation of Zhejiang Province (No. LZ19E060001).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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摘要

脉动热管(PHP)用于散热时其蒸发端直接与电子设备接触，控制良好的蒸发端温度均匀性是保证电子设备安全可靠运行的重要条件。基于此，本文以去离子水作为对照，主要针对以硬脂酸钠作溶质的表面活性剂溶液（浓度分别为0.001 wt%、0.002 wt%和0.004 wt%）在不同充液率（充液率分别为0.31、0.44和0.57）、不同热流密度下（ (1911–19 427) W/m2），脉动热管蒸发端温度均匀性进行了实验研究。实验结果表明，在所有测试工况下，PHP的最高温度通常出现在蒸发端的中间区域。随着热流密度的增加，工作流体流动模式变化，蒸发端中不同区域之间的温差先升高后降低。相比去离子水-PHP，硬脂酸钠溶液-PHP的蒸发端温度均匀性更好，这表明降低工作流体的表面张力可以提高PHP蒸发端温度均匀性。此外，在不同的充液率下，由于流体表面张力和粘度的共同影响，达到优化的蒸发温度均匀性所需的表面活性剂溶液浓度也不同。具体而言，当充液率为0.31和0.44时，最佳蒸发温度均匀性所对应的溶液浓度为0.004 wt%；而当充液率为0.57时，最佳蒸发温度均匀性所对应的溶液浓度为0.002 wt%。

关键词： pulsating heat pipe; surface tension; evaporating temperature uniformity; heat transfer

本文引用格式

BAO Kangli , WANG Xuehui , ZHANG Peng-E , HAN Xiaohong , TAN Jianming . Evaporating Temperature Uniformity of the Pulsating Heat Pipe with Surfactant Solutions at Different Concentrations[J]. 热科学学报, 2023 , 32(1) : 183 -191 . DOI: 10.1007/s11630-022-1756-9

Abstract

The evaporating section of the pulsating heat pipe (PHP) is in direct contact with the electronics when it is used for heat dissipation, and thus the evaporating temperature uniformity has an important effect on the safe and reliable operation of electronic equipment. On the basis of these conditions, an experimental study on the evaporating temperature uniformity of the PHP with surfactant solutions at different concentrations was conducted at the heat fluxes of (1911–19 427) W/m2. Sodium stearate was utilized for the solute; the surfactant solutions were prepared with the concentrations of 0.001 wt%, 0.002 wt%, and 0.004 wt%, respectively, and the filling ratios of the PHP were 0.31, 0.44 and 0.57, respectively. The experimental results revealed that under all tested working conditions, the highest temperature always appeared in the intermediate zone of the evaporating section. As the heat flux increased, the temperature differences among different zones rose initially and then reduced due to the change of the flow motion and the flow pattern. The evaporating temperature uniformity of the sodium stearate solutions-PHP was better than that of the deionized water-PHP, which suggested that the evaporating temperature uniformity might be improved through decreasing the surface tension. Furthermore, combined with the effect of surface tension and viscosity, for different filling ratios, the required concentration was different when the best evaporating temperature uniformity was achieved. To be specific, when the filling ratio were 0.31 and 0.44, the best evaporating temperature uniformity was achieved at the concentration of 0.004 wt%, while at the filling ratio of 0.57, the best evaporating temperature uniformity was attained at the concentration of 0.002 wt%.

Key words： pulsating heat pipe; surface tension; evaporating temperature uniformity; heat transfer

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