Experimental study of the heater size effect on subcooled pool boiling heat transfer of FC-72 in microgravity

doi:10.1016/j.expthermflusci.2016.03.031

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	Experimental study of the heater size effect on subcooled pool boiling heat transfer of FC-72 in microgravity
	Wang XL; Zhang YH; Qi BJ; Zhao JF(赵建福); Wei JJ; Wei, JJ (reprint author), Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Xian 710049, Peoples R China.
发表期刊	EXPERIMENTAL THERMAL AND FLUID SCIENCE
	2016
卷号	76 页码:275-286
ISSN	0894-1777
摘要	Experiments of highly subcooled nucleate pool boiling of FC-72 with dissolved air were conducted on a large scale silicon chip (2 x 2 x 0.05 cm(3), denoted as chip S 2 x 2) in short-term microgravity condition and normal gravity condition by utilizing the drop tower in Beijing respectively. The results were compared with published results of a smaller scale chip (1 x 1 x 0.05 cm(3), denoted as chip S 1 x 1) both in normal gravity condition and microgravity condition, to study the heater size effect on boiling heat transfer. It is indicated that in microgravity, the input heat flux range in which bubble departure took place for chip S 2 x 2 is wider than that for chip S 1 x 1, and an interesting phenomenon observed is that coalesced bubbles departed at a continuously smaller radii at a given heat flux. Initially, the average bubble departure radii for chip S 2 x 2 increased linearly with heat flux while later remained constant. At a same heat flux, chip S 2 x 2 showed a bubble departure radius larger than that of chip S 1 x 1. By comparison, it is found that nucleate boiling performance deteriorates with increase in heater size in both earth gravity condition and microgravity condition. However, in microgravity the q(CHF) of chip S 2 x 2 is 20% greater than that of chip S 1 x 1, contrary to the CHF characteristic in earth ground condition. Moreover, boiling patterns in microgravity are different in high heat flux region: a smooth hemispherical bubble was generated on chip S 1 x 1, while on chip S 2 x 2 an oblate vapor blanket was formed, which indicates that different dominated boiling heat transfer mechanisms exist in both cases. It is found that in microgravity, the boiling was dominated by buoyancy for chip S 2 x 2, but it was in surface tension dominated boiling regime for chip S 1 x 1, which proved the above speculation. Moreover, the range of transition heater size criteria is 1.45 < L-h/L-c < 2.89 in the present work. By using the updated model developed by Raj and Kim, it is discovered that predicted values are generally lower than experimental values in both experiments. Moreover, differences were more evident for chip S 2 x 2. (C) 2016 Elsevier Inc. All rights reserved.
关键词	Thermodiffusion Segregation Multicomponent Mixtures Oil And Gas Molecular Dynamics
DOI	10.1016/j.expthermflusci.2016.03.031
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000376694900027
关键词[WOS]	Thermodiffusion ; Segregation ; Multicomponent mixtures ; Oil and gas ; Molecular dynamics
WOS研究方向	Thermodynamics ; Engineering ; Physics
WOS类目	Thermodynamics ; Engineering, Mechanical ; Physics, Fluids & Plasmas
项目资助者	The authors gratefully appreciate the financial supports from the project of National Natural Science Foundation of China (No. 51225601) and the Key Laboratory of Microgravity/CAS for experiments utilizing the drop tower Beijing.
课题组名称	NML微重力两相流与燃烧
论文分区	一类
力学所作者排名	False
引用统计	被引频次：16[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/59531
专题	微重力重点实验室
通讯作者	Wei, JJ (reprint author), Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Xian 710049, Peoples R China.
推荐引用方式 GB/T 7714	Wang XL,Zhang YH,Qi BJ,et al. Experimental study of the heater size effect on subcooled pool boiling heat transfer of FC-72 in microgravity[J]. EXPERIMENTAL THERMAL AND FLUID SCIENCE,2016,76:275-286.
APA	Wang XL,Zhang YH,Qi BJ,赵建福,Wei JJ,&Wei, JJ .(2016).Experimental study of the heater size effect on subcooled pool boiling heat transfer of FC-72 in microgravity.EXPERIMENTAL THERMAL AND FLUID SCIENCE,76,275-286.
MLA	Wang XL,et al."Experimental study of the heater size effect on subcooled pool boiling heat transfer of FC-72 in microgravity".EXPERIMENTAL THERMAL AND FLUID SCIENCE 76(2016):275-286.

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