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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.
Source PublicationEXPERIMENTAL THERMAL AND FLUID SCIENCE
2016
Volume76Pages:275-286
ISSN0894-1777
AbstractExperiments 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.
KeywordThermodiffusion Segregation Multicomponent Mixtures Oil And Gas Molecular Dynamics
DOI10.1016/j.expthermflusci.2016.03.031
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000376694900027
WOS KeywordThermodiffusion ; Segregation ; Multicomponent mixtures ; Oil and gas ; Molecular dynamics
WOS Research AreaThermodynamics ; Engineering ; Physics
WOS SubjectThermodynamics ; Engineering, Mechanical ; Physics, Fluids & Plasmas
Funding OrganizationThe 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.
DepartmentNML微重力两相流与燃烧
Classification一类
RankingFalse
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/59531
Collection国家微重力实验室
Corresponding AuthorWei, JJ (reprint author), Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Xian 710049, Peoples R China.
Recommended Citation
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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