Premlata, A R and Karri, Badarinath and Sahu, Kirti Chandra and et al, .
(2016)
Dynamics of an air bubble rising in a non-Newtonian liquid in the axisymmetric regime.
In: Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017), 27-30, December 2017, BITS-Pilani, Hyderabad.
Full text not available from this repository.
(
Request a copy)
Abstract
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 di↵erent Gallilei and E¨otv¨os numbers. The e↵ect 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 E¨otv¨os number.
Actions (login required)
 |
View Item |
Altmetric
Altmetric