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Time-resolved imaging of a compressible air disc under a drop impacting on a solid surface

Published online by Cambridge University Press:  07 September 2015

E. Q. Li  and
S. T. Thoroddsen
E. Q. Li
Affiliation:
Division of Physical Sciences and Engineering and Clean Combustion Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
S. T. Thoroddsen*
Affiliation:
Division of Physical Sciences and Engineering and Clean Combustion Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
*
†Email address for correspondence: sigurdur.thoroddsen@kaust.edu.sa
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Abstract

When a drop impacts on a solid surface, its rapid deceleration is cushioned by a thin layer of air, which leads to the entrapment of a bubble under its centre. For large impact velocities the lubrication pressure in this air layer becomes large enough to compress the air. Herein we use high-speed interferometry, with 200 ns time-resolution, to directly observe the thickness evolution of the air layer during the entire bubble entrapment process. The initial disc radius and thickness shows excellent agreement with available theoretical models, based on adiabatic compression. For the largest impact velocities the air is compressed by as much as a factor of 14. Immediately following the contact, the air disc shows rapid vertical expansion. The radial speed of the surface minima just before contact, can reach 50 times the impact velocity of the drop.

JFM classification

Drops and Bubbles: Bubble dynamics Drops and Bubbles: Drops and Bubbles Low-Reynolds-number flows: Lubrication theory
Type
Papers
Information
Journal of Fluid Mechanics , Volume 780 , 10 October 2015 , pp. 636 - 648
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Copyright
© 2015 Cambridge University Press 

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Li and Thoroddsen supplementary movie

Shape of air-disc after contact for conditions in Figure 3(c).

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Li and Thoroddsen supplementary movie

Interference fringes corresponding to Figure 3(d,e).

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Video 9.4 MB

Li and Thoroddsen supplementary movie

Interference fringes corresponding to Figure 3f.

Download Li and Thoroddsen supplementary movie(Video)
Video 10.1 MB