Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.184501
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Funding
- National Natural Science Foundation of China [11542016, 11702210, 11802226, 11850410439]
- Cyrus Tang Foundation through the Tang Scholar program
- KAUST [URF/1/3727-01-01]
- [B18040]
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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, Oh(e), based on the air-disk thickness. For the lowest Oh(e), 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.
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