Supersonic Air Flow due to Solid-Liquid Impact


Gekle, Stephan and Peters, Ivo R. and Gordillo, Jose Manuel and Meer, Devaraj van der and Lohse, Detlef (2010) Supersonic Air Flow due to Solid-Liquid Impact. Physical Review Letters, 104 (2). 024501. ISSN 0031-9007

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Abstract:A solid object impacting on liquid creates a liquid jet due to the collapse of the impact cavity. Using visualization experiments with smoke particles and multiscale simulations, we show that in addition, a high-speed air jet is pushed out of the cavity. Despite an impact velocity of only 1  m/s, this air jet attains supersonic speeds already when the cavity is slightly larger than 1 mm in diameter. The structure of the air flow closely resembles that of compressible flow through a nozzle—with the key difference that here the “nozzle” is a liquid cavity shrinking rapidly in time
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