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Flow pattern transition and destabilization mechanism of thermocapillary convection for low Prandtl number fluid in a deep annular pool with surface heat dissipation
Zhang L; Li YR; Wu CM; Liu QS(刘秋生)
2018-11-01
发表期刊INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷号126页码:118-127
ISSN0017-9310
摘要In order to understand clearly the flow pattern transition and the destabilization mechanism of thermocapillary convection for low Prandtl number fluids in a deep annular pool with surface heat dissipation, we carried out a series of three-dimensional numerical simulations by using the finite volume method. The radius ratio and the aspect ratio of an annular pool are respectively fixed at 0.5 and 1.0. Prandtl number of the working fluid is 0.011. Because the total heat dissipation coefficient on the free surface for low Prandtl fluids is small, Biot number is varied from 0 to 1.0. Results indicate that thermocapillary convection experiences the transitions from axisymmetric steady state flow into three dimensional steady flow and then into three-dimensional oscillation flow with the increase of Marangoni number. The critical Marangoni number of flow pattern transition decreases slightly with the increase of Biot number, and the maximum temperature and velocity fluctuations appear near the lower part of outer wall. The azimuthal temperature fluctuation on the free surface gradually shrinks to the inner wall, and the temperature fluctuation region decreases. However, it remains almost unchanged near the bottom of the annular pool, but the fluctuation amplitude increases. (C) 2018 Elsevier Ltd. All rights reserved.
关键词Thermocapillary convection Low Prandtl number fluid Surface heat dissipation Flow pattern transition Annular pool
DOI10.1016/j.ijheatmasstransfer.2018.05.120
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收录类别SCI ; EI
语种英语
WOS记录号WOS:000442972700011
关键词[WOS]HORIZONTAL TEMPERATURE-GRADIENT ; OPEN CYLINDRICAL ANNULI ; LIQUID LAYERS ; MARANGONI CONVECTION ; BINARY-MIXTURE ; BUOYANCY FLOW ; INSTABILITIES ; CAVITY ; WAVES ; MICROGRAVITY
WOS研究方向Thermodynamics ; Engineering, Mechanical ; Mechanics
WOS类目Thermodynamics ; Engineering ; Mechanics
项目资助者National Natural Science Foundation of China [51776022, 11532015]
论文分区一类
力学所作者排名4
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文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/77930
专题国家微重力实验室
作者单位1.Chongqing Univ, Coll Power Engn, Key Lab Low Grade Energy Utilizat Technol & Syst, Minist Educ, Chongqing 400044, Peoples R China
2.Sichuan Int Studies Univ, Chongqing Nanfang Translators Coll, Chongqing 401120, Peoples R China
3.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Natl Micrograv Lab, Beijing 100190, Peoples R China
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Zhang L,Li YR,Wu CM,et al. Flow pattern transition and destabilization mechanism of thermocapillary convection for low Prandtl number fluid in a deep annular pool with surface heat dissipation[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2018,126:118-127.
APA Zhang L,Li YR,Wu CM,&刘秋生.(2018).Flow pattern transition and destabilization mechanism of thermocapillary convection for low Prandtl number fluid in a deep annular pool with surface heat dissipation.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,126,118-127.
MLA Zhang L,et al."Flow pattern transition and destabilization mechanism of thermocapillary convection for low Prandtl number fluid in a deep annular pool with surface heat dissipation".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 126(2018):118-127.
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