Journal of Fluid Mechanics



Shock-induced collapse of single cavities in liquids


N. K.  Bourne a1 and J. E.  Field a1
a1 Cavendish Laboratory, Madingley Road, Cambridge, CB3 0HE. UK

Article author query
bourne nk   [Google Scholar] 
field je   [Google Scholar] 
 

Abstract

A two-dimensional method was used to observe the interactions of plane shock waves with single cavities. This allowed study of processes occurring within the cavity during collapse. Results were obtained from high-speed framing photography. A variety of collapse shock pressures were launched into thin liquid sheets either by firing a rectangular projectile or by using an explosive plane-wave generator. The range of these shock pressures was from 0.3 to 3.5 GPa. Cavities were found to collapse asymmetrically to produce a high-speed liquid jet which was of approximately constant velocity at low shock pressures. At high pressures, the jet was found to accelerate and crossed the cavity faster than the collapse-shock traversed the same distance in the liquid. In the final moments of collapse, high temperatures were concentrated in two lobes of trapped gas and light emission was observed from these regions. Other cavity shapes were studied and in the case of cavities with flat rear walls, multiple jets were observed to form during the collapse.

(Published Online April 26 2006)
(Received December 11 1991)
(Revised April 13 1992)



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