Bubble capture, breakup, and coalescence in vortex–bubble interaction

Biswas, S. and Govardhan, R.N. (2021) Bubble capture, breakup, and coalescence in vortex–bubble interaction. In Lecture Notes in Mechanical Engineering. 33–41 . (doi:10.1007/978-981-15-5183-3_4).

Record type: Conference or Workshop Item (Paper)

Abstract

Driven by the motivation to understand breakup and coalescence of bubbles in turbulent flows, we experimentally study an idealization of this, namely interaction of an air bubble with a vortex ring in water. This study is carried out at different ring Reynolds numbers (ReΓ) for a fixed ratio of bubble’s volume to ring’s core volume (VR) of about 0.1. The interaction dynamics is governed by a Weber number (We), which is defined here as the ratio of the vortex core’s strength to the Laplace pressure, and has a broad range of about 12–763 in the present study. Several stages of bubble dynamics starting from bubble capture by the ring, to bubble breakup and coalescence are explored using high-speed shadowgraphy technique. Changes in several bubble dynamics aspects such as bubble’s equilibrium position inside a vortex, azimuthal elongation, and breakup pattern(s) are witnessed among low and high Weber number cases, and these are described in the present work.

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