Coalescence dynamics of a hollow droplet falling in a liquid pool

Deka, Hiranya and Biswas, Gautam and Sahu, Kirti Chandra and Kulkarni, Yash and Dalal, Amaresh (2019) Coalescence dynamics of a hollow droplet falling in a liquid pool. Journal of Fluid Mechanics, 866. ISSN 0022-1120

Preview

Text
2019_Deka_JFM.pdf
Download (7MB) | Preview

Abstract

The partial coalescence dynamics of a hollow droplet in a liquid pool is numerically investigated. We study the effect of the ratio of the inner to outer radii (Rr) of the hollow droplet while maintaining a constant volume. It is observed that for small values of the radius ratio, the coalescence dynamics is similar to that of a ‘filled’ droplet, but the partial coalescence is suppressed for large values of Rr. Increasing the value of 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.

[error in script]

IITH Creators: