Supersonic Air Flow due to Solid-Liquid Impact

Gekle, Stephan and Peters, Ivo R. and Gordillo, Jose Manuel and Meer van der, Devaraj 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
Item Type:	Article
Copyright:	© American Physical Society
Faculty:	Science and Technology (TNW)
Research Group:	Physics of Fluids (POF)
Link to this item:	http://purl.utwente.nl/publications/79234
Official URL:	http://dx.doi.org/10.1103/PhysRevLett.104.024501
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