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Title:
Elastic instability in the thermocapillary convection at low Reynolds numbers
Author: Hu KX(胡凯鑫); Liu R(刘荣); He, Meng; Chen QS(陈启生)
Source: JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
Issued Date: 2017-12-01
Volume: 250, Pages:43-51
Abstract:

It is well known that the plane channel flows of UCM and Oldroyd-B fluids are linearly stable at low Reynolds numbers. However, an elastic instability is detected by modal analysis in the thermocapillary convection with straight streamlines. The instability appears when the Weissenberg number is in the order of 1. When the Reynolds number is small enough, the critical Weissenberg number is almost a constant, which only depends on the Marangoni number. The unstable waves include a wide range of wave number and can be streamwise and oblique. The free surface with thermocapillary effect is crucial for the instability, as it induces the normal stress in the basic flow and reduces the constraint on perturbations.

Keyword: Viscoelastic ; Elastic instability ; Thermocapillary
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Hu, KX
DOI: 10.1016/j.jnnfm.2017.10.009
DOC Type: Article
WOS Subject: Mechanics
WOS Subject Extended: Mechanics
WOS Keyword Plus: VISCOELASTIC FLUIDS ; CHANNEL FLOWS ; COUETTE-FLOW ; POLYMER-SOLUTION ; SURFACE-TENSION ; LIQUID BRIDGES ; AMPLIFICATION ; STABILITY ; DISTURBANCES ; LAYERS
WOS ID: WOS:000418215700005
ISSN: 0377-0257
Funder: National Science Foundation of China(11402271 ; Ningbo University ; 11532015)
Classification: 二类/Q1
Ranking: 3
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/72231
Appears in Collections:国家微重力实验室_期刊论文

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Recommended Citation:
Hu KX,Liu R,He, Meng,et al. Elastic instability in the thermocapillary convection at low Reynolds numbers[J]. JOURNAL OF NON-NEWTONIAN FLUID MECHANICS,2017-12-01,250:43-51.
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