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To split or not to split: dynamics of an air disk formed under a drop impacting on a pool

Jian, Zhen, Channa, Murad Ali, Kherbeche, Abderrahmane, Chizari, Hossain, Thoroddsen, Sigurdur T. and Thoraval, Marie-Jean 2020. To split or not to split: dynamics of an air disk formed under a drop impacting on a pool. Physical Review Letters 124 (18) , 184501. 10.1103/PhysRevLett.124.184501

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Abstract

When a drop falls and impacts on a liquid pool, it entraps an air disk below the drop, which then contracts into a central bubble. Here, we use high-speed imaging and high-resolution numerical simulations to characterize the air-disk contraction dynamics for different liquid properties. We show that the air disk can contract into a single central bubble, form a toroidal bubble, or split vertically into two smaller bubbles. We demonstrate that the transitions between the different regimes can be separated by an Ohnesorge number, Ohe, based on the air-disk thickness. For the lowest Ohe, we find a new regime, where vortex shedding from the rim of the contracting air disk breaks the vertical symmetry and prevents the bubble from splitting in two.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: American Physical Society
ISSN: 0031-9007
Date of Acceptance: 19 March 2020
Last Modified: 19 Oct 2021 01:22
URI: https://orca.cardiff.ac.uk/id/eprint/135208

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