Ram, Premlata Amarnath and Sahu, Kirti Chandra
(2017)
Dynamics of an air bubble rising in
viscosity-stratified
fluids.
Masters thesis, Indian Institute of Technology, Hyderabad.
Abstract
The bubble rise dynamics in an unconfined quiescent viscosity-stratified medium has been numerically
investigated. This is frequently encountered in industrial as well as natural phenomena. In
spite of the large number of studies carried out on bubbles and drops, very few studies have examined
the influence of viscosity stratification on bubble rise dynamics. To the best of our knowledge,
none of them have isolated the effects of viscosity-stratification alone, even though it is known to
influence the dynamics extensively, which is the main objective of the present study. Our results
demonstrate some counter-intuitive phenomena for certain range of parameters due to the presence
of viscosity stratification in the surrounding fluid. It is also observed that the effect of viscosity
stratification is qualitatively different for different regimes of the dimensionless parameters. In future,
it will be interesting to investigate this problem in three-dimensions
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