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Numerical simulation of a bubble rising in shear-thinning fluids
Zhang L(张丽); Yang C; Mao ZS
Source PublicationJournal of Non-Newtonian Fluid Mechanics
2010
Volume165Issue:11-12Pages:555-567
ISSN0377-0257
AbstractThe motion of a single bubble rising freely in quiescent non-Newtonian viscous fluids was investigated experimentally and computationally. The non-Newtonian effects in the flow of viscous inelastic fluids are modeled by the Carreau theological model. An improved level set approach for computing the incompressible two-phase flow with deformable free interface is used. The control volume formulation with the SIMPLEC algorithm incorporated is used to solve the governing equations on a staggered Eulerian grid. The simulation results demonstrate that the algorithm is robust for shear-thinning liquids with large density (rho(1)/rho(g) up to 10(3)) and high viscosity (eta(1)/eta(g) up to 10(4)). The comparison of the experimental measurements of terminal bubble shape and velocity with the computational results is satisfactory. It is shown that the local change in viscosity around a bubble greatly depends on the bubble shape and the zero-shear viscosity of non-Newtonian shear-thinning liquids. The shear-rate distribution and velocity fields are used to elucidate the formation of a region of large viscosity at the rear of a bubble as a result of the rather stagnant flow behind the bubble. The numerical results provide the basis for further investigations, such as the numerical simulation of viscoelastic fluids. (C) 2010 Elsevier B.V. All rights reserved.
DOI10.1016/j.jnnfm.2010.02.012
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Indexed BySCI
Language英语
WOS IDWOS:000278564300001
WOS KeywordLEVEL SET APPROACH ; MASS-TRANSFER ; COMPUTING SOLUTIONS ; RISE VELOCITY ; 2-PHASE FLOW ; LIQUIDS ; DROP ; SYSTEMS ; SPHERE ; MOTION
WOS Research AreaMechanics
WOS SubjectMechanics
Funding OrganizationNational Natural Science Foundation of China [20990224, 20676134] ; 973 Program [2010CB630904] ; National Project of Scientific and Technical Supporting Program [2008BAF33B03] ; 863 Key Project [2007AA060904]
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/43501
Collection非线性力学国家重点实验室
Recommended Citation
GB/T 7714
Zhang L,Yang C,Mao ZS. Numerical simulation of a bubble rising in shear-thinning fluids[J]. Journal of Non-Newtonian Fluid Mechanics,2010,165(11-12):555-567.
APA 张丽,Yang C,&Mao ZS.(2010).Numerical simulation of a bubble rising in shear-thinning fluids.Journal of Non-Newtonian Fluid Mechanics,165(11-12),555-567.
MLA 张丽,et al."Numerical simulation of a bubble rising in shear-thinning fluids".Journal of Non-Newtonian Fluid Mechanics 165.11-12(2010):555-567.
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