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Title:
Effect of gravity on the stability of viscoelastic thermocapillary liquid layers
Author: Hu KX(胡凯鑫); He M; Chen QS(陈启生); Liu R(刘荣)
Source: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Issued Date: 2018-08-01
Volume: 123, Pages:776-786
English Abstract: Thermocapillary convection appears in many polymer processing operations. In order to understand the effect of gravity for its stability, three-dimensional linear stability analysis is performed for a viscoelastic fluid. The critical Marangoni number is derived as a function of Bond number, Prandtl number and elasticity. When the Prandtl number is large, the increasing of gravity effect often makes the flow more stable, and the coupling of gravity to elasticity and thermocapillary force excites many different kinds of preferred modes. For small Prandtl number, the flow is always destabilized by gravity effect. The work done by gravity becomes a new energy source for perturbation. However, it can be either positive or negative, which is not directly related to the variation of critical Marangoni number with gravity. The effect of gravity on the instability mechanism and the properties of preferred modes are demonstrated for different elasticity. (C) 2018 Elsevier Ltd. All rights reserved.
Language: 英语
Indexed Type: SCI ; EI
DOI: 10.1016/j.ijheatmasstransfer.2018.02.088
DOC Type: Article
WOS Subject: Thermodynamics ; Engineering, Mechanical ; Mechanics
WOS Subject Extended: Thermodynamics ; Engineering ; Mechanics
WOS Keyword Plus: HORIZONTAL FLUID LAYER ; INCLINED TEMPERATURE-GRADIENT ; SURFACE-TENSION ; POLYMER-SOLUTION ; CONVECTION ; INSTABILITIES ; FLOW ; SUBJECT ; DRIVEN ; NUMBER
WOS ID: WOS:000434887000065
ISSN: 0017-9310
Funder: National Natural Science Foundation of China(11402271 ; K.C. Wong Magna Fund in Ningbo University ; 11532015 ; U1738119)
Classification: 一类
Ranking: 3
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/77511
Appears in Collections:国家微重力实验室_期刊论文

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Recommended Citation:
Hu KX,He M,Chen QS,et al. Effect of gravity on the stability of viscoelastic thermocapillary liquid layers[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2018-08-01,123:776-786.
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所有评论 (1)
陈启生
2018-08-03 12:50

第一作者:胡开鑫

 

 
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