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Linear stability of thermocapillary liquid layers of a shear-thinning fluid
Hu KX(胡凯鑫); He M; Chen QS(陈启生); Liu R(刘荣); Hu, KX (reprint author), Ningbo Univ, Sch Mech Engn & Mech, Ningbo 315211, Zhejiang, Peoples R China.
Source PublicationPHYSICS OF FLUIDS
2017-07-01
Volume29Issue:7Pages:073101
ISSN1070-6631
Abstract

The linear stability analysis has been performed for the thermocapillary liquid layers of a shear-thinning fluid. The Carreau fluid model is applied to describe the rheological property. The critical parameters are determined as a function of Prandtl number (Pr), degree of shear-thinning, and gravity level. For linear flow, the shear-thinning effect is destabilizing for small and moderate Pr but increases the stability slightly for large Pr. For return flow, the perturbation kinetic energy concentrates near the surface, and the flow is stabilized when the surface viscosity is used. The streamwise wave is excited at large Pr, and a new mechanism is found at moderate Pr, where the hot spots appear at the bottom of the layer. In the presence of gravity, the viscosity stratification is enhanced and more kinds of different modes are excited. The preferred mode changes to downstream at large Pr while the gravity becomes an important perturbation energy source at small Pr. The shear-thinning effect for the instability mechanism is discussed and the comparisons are made with channel flows. Published by AIP Publishing.

DOI10.1063/1.4994596
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000406765200014
WOS KeywordPOWER-LAW FLUID ; INSTABILITY MECHANISMS ; MARANGONI CONVECTION ; POLYMER-SOLUTION ; FLOW ; SURFACE ; VISCOSITY
WOS Research AreaMechanics ; Physics
WOS SubjectMechanics ; Physics, Fluids & Plasmas
Funding OrganizationNational Science Foundation of China(11402271 ; K. C. Wong Magna Fund in Ningbo University ; 11532015)
DepartmentNML流动稳定性与复杂流动
Classification一类/力学重要期刊
Ranking3
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/70033
Collection国家微重力实验室
Corresponding AuthorHu, KX (reprint author), Ningbo Univ, Sch Mech Engn & Mech, Ningbo 315211, Zhejiang, Peoples R China.
Recommended Citation
GB/T 7714
Hu KX,He M,Chen QS,et al. Linear stability of thermocapillary liquid layers of a shear-thinning fluid[J]. PHYSICS OF FLUIDS,2017,29(7):073101.
APA Hu KX,He M,Chen QS,Liu R,&Hu, KX .(2017).Linear stability of thermocapillary liquid layers of a shear-thinning fluid.PHYSICS OF FLUIDS,29(7),073101.
MLA Hu KX,et al."Linear stability of thermocapillary liquid layers of a shear-thinning fluid".PHYSICS OF FLUIDS 29.7(2017):073101.
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