Experimental Study on Flow Boiling Heat Transfer Characteristics of Microencapsulated Phase Change Material Suspension

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  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
    3. Nanjing Institute of Future Energy System, Nanjing 211135, China

网络出版日期: 2023-11-27

基金资助

This work was supported by the Scientific Instrument Developing Project of the Chinese Academy of Sciences (Grant No. YJKYYQ20200016) and the National Natural Science Foundation of China (Grant No. 52106117).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Experimental Study on Flow Boiling Heat Transfer Characteristics of Microencapsulated Phase Change Material Suspension

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  • 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
    3. Nanjing Institute of Future Energy System, Nanjing 211135, China

Online published: 2023-11-27

Supported by

This work was supported by the Scientific Instrument Developing Project of the Chinese Academy of Sciences (Grant No. YJKYYQ20200016) and the National Natural Science Foundation of China (Grant No. 52106117).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

摘要

基于相变微胶囊材料(MPCM)独特的核心相变特性,它能够显著提升基础流体的传热性能。本文重点探究了氟化液基相变微胶囊材料悬浮液(MPCMS)在竖直透明石英通道中的流动沸腾传热特性。分别分析了MPCM核心相变温度和悬浮液流速对沸腾传热系数和临界热流密度的影响。结论表明,适宜的MPCMS浓度能够显著提高沸腾传热系数和临界热流密度,最高强化率可达22.3%和25%。但是,强化效果会随着悬浮液流速的增加而减弱。结果表明,MPCM的核心相变温度略高于基础流体的沸点时具有最佳的强化效果。通过高速摄影系统观察到了不同热流密度下竖直管中的气泡行为,MPCMS中颗粒的运动和核心相变抑制了气泡的聚集,使大气泡破碎成许多小气泡,进而增强了传热效果。本研究结果为深入探索MPCMS在工业应用中的巨大潜力奠定了基础。

本文引用格式

TAN Zhenyu, LI Xunfeng, HUAI Xiulan, CHENG Keyong, CHEN Junlin . Experimental Study on Flow Boiling Heat Transfer Characteristics of Microencapsulated Phase Change Material Suspension[J]. 热科学学报, 2023 , 32(4) : 1547 -1557 . DOI: 10.1007/s11630-023-1811-1

Abstract

Due to its core phase change characteristics, microencapsulated phase change material (MPCM) can make many base fluids have better heat transfer characteristics. In this paper, the flow boiling heat transfer characteristics of fluorinated liquid-based microencapsulated phase change material suspension (MPCMS) through vertical transparent quartz channel were studied. The effects of MPCM core phase change temperature and suspension flow velocity on boiling heat transfer coefficient and critical heat flux were discussed, respectively. The results show that the appropriate concentration of MPCMS can enhance both the boiling heat transfer coefficient and the critical heat flux. The strengthening effect becomes weak with the increase of suspension flow velocity. The maximum strengthening rates of critical heat flux appear at 0.05 m/s, which are 25% (MPCMS (70°C)), 16% (MPCMS (58°C)) and 10% (MPCMS (28°C)). The phase change temperature of the MPCM core has important effects on the boiling heat transfer coefficient and the critical heat flux. The results showed that the MPCM with core phase change temperature higher than the boiling temperature of base fluid has the best enhancement effect. Different bubble behavior in vertical tube with different heat flux can be observed by high-speed photography system. The particle core phase change in MPCMS inhibits the aggregation of bubbles and forms many small bubbles to enhance heat transfer. The work lays a foundation for further exploring the industrial application of MPCMS.

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