Dynamics of coalescence of a compound droplet on a liquid pool

Deka, Hiranya and Biswas, Gautam and Sahu, Kirti Chandra (2019) Dynamics of coalescence of a compound droplet on a liquid pool. Journal of Fluid Mechanics, 866. ISSN 0022-1120


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The partial coalescence dynamics of a compound droplet in a liquid pool is numerically investigated. We study the effect of the ratio of the inner to outer radii (Rr) of the compound droplet while maintaining a constant volume equals to that of a ‘simple’ droplet of radius, Req. It is observed that for small values of the radius ratio, the coalescence dynamics is similar to that of a ‘simple’ droplet, but the partial coalescence is suppressed for large values of Rr. Increasing the value of Rr increases the distance migrated by the inner bubble in the downward direction inside the pool away from the free surface. The location of the bubble after coalescence is found to play an important role in the pinch-off process of the satellite droplet. The influence of the governing dimensionless parameters on the coalescence dynamics has also been investigated.

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IITH Creators:
IITH CreatorsORCiD
Sahu, Kirti Chandrahttp://orcid.org/0000-0002-7357-1141
Item Type: Article
Subjects: Chemical Engineering
Divisions: Department of Chemical Engineering
Depositing User: Team Library
Date Deposited: 22 Aug 2019 10:56
Last Modified: 22 Aug 2019 10:56
URI: http://raiith.iith.ac.in/id/eprint/6001
Publisher URL: https://doi.org/10.1017/jfm.2019.137
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