To Split or Not to Split: Dynamics of an Air Disk Formed under a Drop Impacting on a Pool

Zhen Jian, Murad Ali Channa, Abderrahmane Kherbeche, Hossain Chizari, Sigurdur T Thoroddsen, M.-J. Thoraval

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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.
Original languageEnglish (US)
JournalPhysical Review Letters
Issue number18
StatePublished - May 4 2020

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