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Title: Dewetting at the center of a drop impact
Authors: Thoroddsen, S.T. 
Takehara, K.
Etoh, T.G.
Keywords: Dewetting
Drop impact
High-speed imaging
Issue Date: 30-Jan-2009
Citation: Thoroddsen, S.T., Takehara, K., Etoh, T.G. (2009-01-30). Dewetting at the center of a drop impact. Modern Physics Letters B 23 (3) : 361-364. ScholarBank@NUS Repository.
Abstract: When a drop impacts onto a solid surface, it spreads out into a pancake shape and often forms a dry-spot at the center of the drop. We show that this dewetting at the center is sometimes produced by a small bubble of air which is entrapped on the substrate under the center of the drop. Capillary waves are generated on the surface of the pancake, during the rebounding of the lamellar edge. As these capillary waves converge at the axis of symmetry, their amplitude grows in size until a wave trough touches and merges with the entrapped bubble. This opens up a dry-patch at the center of the splash. We use state-of-the art high-speed video imaging to study this process, for a drop impacting onto a Perspex surface. The imaging is done by looking through the bottom plate to reveal the detailed motions of the capillary waves. © 2009 World Scientific Publishing Company.
Source Title: Modern Physics Letters B
ISSN: 02179849
DOI: 10.1142/S0217984909018400
Appears in Collections:Staff Publications

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