微结构表面核化沸腾初始气泡特征的微观观测
Microscopic observation of initial bubbles in nucleate boiling on microstructured surfaces
Received:May 07, 2022  Revised:June 28, 2022
DOI:10.7520/1001-4888-22-116
中文关键词:  池沸腾  微结构  气泡初始温度  动态过程
英文关键词:nucleate boiling  microstructure  onset of nucleate boiling  dynamic process
基金项目:中国科学院合肥大科学中心协同创新培育基金项目(2022HSC-CIP021);国家磁约束核聚变能发展研究专项项目(2019YFE03080400, 2015GB121007);国家自然科学基金项目(T2341001, 22293011)
Author NameAffiliation
WANG Haonan CAS Key Laboratory of Mechanical Behaviour and Design of Materials, University of Science and Technology of China, Hefei, 230026, Anhui, China 
ZHOU Zhanru* CAS Key Laboratory of Mechanical Behaviour and Design of Materials, University of Science and Technology of China, Hefei, 230026, Anhui, China 
HUANG Shenghong CAS Key Laboratory of Mechanical Behaviour and Design of Materials, University of Science and Technology of China, Hefei, 230026, Anhui, China 
ZHAO Kai CAS Key Laboratory of Mechanical Behaviour and Design of Materials, University of Science and Technology of China, Hefei, 230026, Anhui, China 
WANG Guangzu CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, University of Science and Technology of China, Hefei 230026, Anhui, China 
FU Yao CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, University of Science and Technology of China, Hefei 230026, Anhui, China 
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中文摘要:
      工质的沸腾传热特性明显优于其单相传热,所以,沸腾传热技术广泛应用于众多领域的冷却系统和设备中。沸腾传热中气化潜热可以带走大量的热量,同时气泡的生长过程会对液体造成扰动,加强液体与壁面的换热。初始气泡特征是影响核化沸腾传热特性的重要因素,表面结构对初始气泡的生成具有十分重要的影响。本文制备了3种带有不同尺度微结构且比表面积相同的单晶硅片,搭建了一套核化沸腾可视化微观观测实验平台;通过该平台观测气泡生长的动态过程,开展了核化沸腾实验。实验结果证实了微结构较光滑表面对气泡增长均有促进作用,且实验范围内微尺度越大,效果越明显。
英文摘要:
      The heat transfer characteristics of nucleate boiling are significantly higher than that of single-phase heat transfer. Nucleate boiling is widely used in related systems and equipment in many fields such as aviation, aerospace, navigation, electronics, energy, power, air conditioning, refrigeration, and biomedicine. The latent heat of vaporization in boiling heat transfer can take away a large amount of heat, and the bubbles create a disturbance, which can enhance heat transfer. The initial bubble characteristics are an important factor affecting the heat transfer characteristics of nucleation boiling, and the surface structure on the heated wall has a very important influence on the formation of the initial bubbles. The surface structure can change the bubble characteristic parameters, such as the temperature of onset of nucleate boiling, bubble diameter, and nucleation site density, etc. Therefore, understanding the bubble characteristic parameters on the structured surfaces is significant to the development of the enhanced boiling heat transfer mechanism. Three kinds of single crystal silicon wafers with different scale microstructures and the same specific surface area were prepared. A set of nucleation boiling visualization microscopic observation experimental platforms to observe the dynamic process of bubble growth was built. Nucleation boiling test was performed. The experimental results showed that the microstructure on the heating surface could promote the growth of bubbles and the effect might be associated with the structural scale.
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