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Influences of wake-effects on bubble dynamics by utilizing micro-pin-finned surfaces under microgravity
Qi BJ; Wei JJ; Wang XL; Zhao JF(赵建福); Wei, JJ (reprint author), Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Xian 710049, Peoples R China.
Source PublicationAPPLIED THERMAL ENGINEERING
2017
Volume113Pages:1332-1344
ISSN1359-4311
AbstractThe influences of wake on bubble dynamics under various heat fluxes have been studied in microgravity. Nucleate pool boiling experiments of FC-72 on silicon chips fabricated with micro-pin-fins were conducted in 10(-3) gravitational acceleration for 3.6 s. Experimental results indicated that wake field had little influence on bubble dynamics at low heat flux, q = 12.53 W/cm(2), but its effects on bubble dynamics became very great at moderate heat flux, q = 27.89 W/cm(2), and high heat flux, q = 39.54 W/cm(2). More importantly, wake-effects appeared even more significant in microgravity. In the wake field, the horizontal flow of the liquid on micro-pin-finned silicon chips promoted the collision, coalescence and movement of bubbles, and the vertical flow of liquid phase exerted an upward force on bubbles, which can effectively shorten the growth cycle and decrease the departure radius of bubbles. Furthermore, fresh liquid could easily be inhaled into the micro-pin-finned structure owning to the negative pressure in wake region, which can supply sufficient liquid for the growth of bubble, avoiding film boiling. The interaction between the micro-pin-finned structure and the wake effect promoted the process of bubble coalescence and departure effectively, so the process of heat transfer was significantly improved on micro-pin-finned surface. In addition, the flow field and bubble behavior in wake region were also briefly analyzed based on some reasonable simplifications and hypotheses. The theoretical analyses showed that the durations of wake-effects lasted longer than the time periods of the bubble in next generation, and the bubble diameters were also smaller than the thickness of Wake region. Therefore, the dominant bubble of next generation was influenced by the wake field during its ebullition cycle, which is consistent with the experimental phenomenon. (C) 2016 Elsevier Ltd. All rights reserved.
DOI10.1016/j.applthermaleng.2016.11.137
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000394723300128
WOS KeywordWake-effects ; Microgravity ; Micro-pin-fins ; Pool boiling ; Bubble dynamics
WOS Research AreaThermodynamics ; Energy & Fuels ; Engineering ; Mechanics
WOS SubjectThermodynamics ; Energy & Fuels ; Engineering, Mechanical ; Mechanics
Funding OrganizationWe gratefully acknowledge the financial support from the National Natural Science Foundation of China - China under the Grants of 51306141 and 51225601, and the support from the Key Laboratory of Microgravity/CAS for experiments utilizing the drop tower Beijing. The author would like to thank the Drop tower staffs for their help in the present experiments.
DepartmentNML微重力两相流与燃烧
Classification一类
Ranking4
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60092
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
Qi BJ,Wei JJ,Wang XL,et al. Influences of wake-effects on bubble dynamics by utilizing micro-pin-finned surfaces under microgravity[J]. APPLIED THERMAL ENGINEERING,2017,113:1332-1344.
APA Qi BJ,Wei JJ,Wang XL,赵建福,&Wei, JJ .(2017).Influences of wake-effects on bubble dynamics by utilizing micro-pin-finned surfaces under microgravity.APPLIED THERMAL ENGINEERING,113,1332-1344.
MLA Qi BJ,et al."Influences of wake-effects on bubble dynamics by utilizing micro-pin-finned surfaces under microgravity".APPLIED THERMAL ENGINEERING 113(2017):1332-1344.
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