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Experimental study of subcooled flow boiling heat transfer on micro-pin-finned surfaces in short-term microgravity
Zhang YH; Liu B; Zhao JF(赵建福); Deng YP; Wei JJ
2018-10-01
发表期刊EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷号97页码:417-430
ISSN0894-1777
摘要The flow boiling heat transfer of subcooled air-dissolved FC-72 on micro-pin-finned surfaces was studied in microgravity by utilizing the drop tower facility in Beijing. The micro-pin-fins with the dimension of 30 x 30 x 60 mu m(3) (width x thickness x height), named PF30-60, were fabricated on a silicon chip by using the dry etching technique. For comparison, experiments of flow boiling heat transfer in terrestrial gravity were also conducted. The effects of inlet velocity on both flow boiling heat transfer and bubble behavior were explored. It was found that gravity has nearly no effect on flow boiling heat transfer for the departure of the inertial-force dominant bubbles in the low and moderate heat fluxes regions. In contrast, in the high-heat-flux region, the flow boiling heat transfer deteriorates and the critical heat flux (CHF) decreases due to the bubble accumulation in the channel. For PF30-60 at V = 0.5 m/s, the CHF point can be inferred to be between 20.8 and 24.5 W/cm(2), which is 63.0-74.2% of that in normal gravity. Regarding PF30-60 at V = 1.0 m/s, the CHF point can be inferred to be between 25.4 and 31.6 W/cm(2), which is 67.6-84.0% of that in normal gravity. The impact of gravity on CHF is closely linked to the channel geometry parameter and surface modification. The dimensionless numbers, Ch (Channel number) and Sf (Surface number), were proposed to describe the effect of the channel geometry and surface modification on the ratio of CHF in microgravity to that in normal gravity (CHF mu g/CHF1g). An empirical correlation based on We (Weber number), Ch and Sf was proposed to predict the value of CHF mu g/CHF1g ratio in good agreement with the experimental data. This study provides a new perspective to determine the threshold inlet velocity of inertial-force-dominant flow boiling under different experimental conditions at different gravity levels.
关键词Microgravity Flow boiling Micro-pin-fins Heat transfer Critical heat flux
DOI10.1016/j.expthermflusci.2018.05.003
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收录类别SCI ; EI
语种英语
WOS记录号WOS:000439675900038
关键词[WOS]VERTICAL RECTANGULAR CHANNEL ; BUBBLE DYNAMICS ; SILICON CHIPS ; 2-PHASE FLOW ; NANO-FLUIDS ; FLUX ; FC-72 ; GRAVITY ; SPACE ; BEHAVIOR
WOS研究方向Thermodynamics ; Engineering, Mechanical ; Physics, Fluids & Plasmas
WOS类目Thermodynamics ; Engineering ; Physics
项目资助者National Natural Science Foundation of China [51506169, 51636006, 51611130060] ; Fundamental Research Funds For the Central Universities [cxtd2017004, xjj2017085] ; scientific research program for new lecturer of Xi'an Jiaotong University [DW010728K000000B] ; China Postdoctoral Science Foundation [2015M582653] ; Postdoctoral Research Project of Shaanxi Province [2016BSHEDZZ131]
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力学所作者排名3
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文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/77938
专题国家微重力实验室
作者单位1.Xi An Jiao Tong Univ, Sch Chem Engn & Technol, Xian 710049, Shaanxi, Peoples R China
2.Chinese Acad Sci, Inst Mech, CAS Key Lab Micrograv, Beijing 100190, Peoples R China
3.Xicrn Jiaotong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China
4.Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 00049, Peoples R China
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Zhang YH,Liu B,Zhao JF,et al. Experimental study of subcooled flow boiling heat transfer on micro-pin-finned surfaces in short-term microgravity[J]. EXPERIMENTAL THERMAL AND FLUID SCIENCE,2018,97:417-430.
APA Zhang YH,Liu B,赵建福,Deng YP,&Wei JJ.(2018).Experimental study of subcooled flow boiling heat transfer on micro-pin-finned surfaces in short-term microgravity.EXPERIMENTAL THERMAL AND FLUID SCIENCE,97,417-430.
MLA Zhang YH,et al."Experimental study of subcooled flow boiling heat transfer on micro-pin-finned surfaces in short-term microgravity".EXPERIMENTAL THERMAL AND FLUID SCIENCE 97(2018):417-430.
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