Dynamics of an air bubble rising in a non-Newtonian liquid in the axisymmetric regime

Premlata, A R and Tripathi, M K and Karri, Badarinath and Sahu, Kirti Chandra (2017) Dynamics of an air bubble rising in a non-Newtonian liquid in the axisymmetric regime. Journal of Non-Newtonian Fluid Mechanics, 239. pp. 53-61. ISSN 0377-0257

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An air bubble rising in a non-Newtonian fluid (shear thinning/thickening) has been numerically studied using a volume-of-fluid (VoF) approach in the axisymmetric regime. The governing equations consist of mass and momentum conservation, coupled to an equation for the volume fraction of the non-Newtonian fluid, which is modelled using the Carreau-Yasuda model. The solver is validated extensively by performing grid convergence test and comparing with the earlier studies in the literature. A parametric study is conducted by varying the shear-thinning/thickening tendency of the surrounding fluid for different Gallilei and Eötvös numbers. The effect of these parameters is quantified in terms of their influence on the aspect ratio of the bubble, the position of the center of gravity and the bubble shape as these evolve over time. We found that increasing the shear thinning tendency increases the rise velocity, and reduces the deformations of the bubble. The deformation of the bubble is also enhanced for higher Gallilei number and low Eötvös number.

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IITH Creators:
IITH CreatorsORCiD
Karri, BadarinathUNSPECIFIED
Sahu, Kirti Chandrahttp://orcid.org/0000-0002-7357-1141
Item Type: Article
Uncontrolled Keywords: Numerical simulation; Bubble; Non-Newtonian fluid
Subjects: Physics > Mechanical and aerospace
Physics > Fluid mechanics
Chemical Engineering > Biochemical Engineering
Divisions: Department of Chemical Engineering
Department of Physics
Depositing User: Team Library
Date Deposited: 09 Dec 2016 08:32
Last Modified: 20 Sep 2017 09:17
URI: http://raiith.iith.ac.in/id/eprint/2926
Publisher URL: https://doi.org/10.1016/j.jnnfm.2016.12.003
OA policy: http://www.sherpa.ac.uk/romeo/issn/0377-0257/
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