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RESEARCH PAPERS

High Speed Liquid Impact Onto Wetted Solid Surfaces

[+] Author and Article Information
H. H. Shi, J. E. Field, C. S. J. Pickles

Physics and Chemistry of Solids, Cavendish Laboratory, Departement of Physics, Madingley Road, Cambridge, CB3 OHE, United Kingdom

J. Fluids Eng 116(2), 345-348 (Jun 01, 1994) (4 pages) doi:10.1115/1.2910278 History: Received October 16, 1992; Revised August 15, 1993; Online May 23, 2008

Abstract

The mechanics of impact by a high-speed liquid jet onto a solid surface covered by a liquid layer is described. After the liquid jet contacts the liquid layer, a shock wave is generated, which moves toward the solid surface. The shock wave is followed by the liquid jet penetrating through the layer. The influence of the liquid layer on the side jetting and stress waves is studied. Damage sites on soda-lime glass, PMMA (polymethylmethacrylate) and aluminium show the role of shear failure and cracking and provide evidence for analyzing the impact pressure on the wetted solids and the spatial pressure distribution. The liquid layer reduces the high edge impact pressures, which occur on dry targets. On wetted targets, the pressure is distributed more uniformly. Despite the cushioning effect of liquid layers, in some cases, a liquid can enhance material damage during impact due to penetration and stressing of surface cracks.

Copyright © 1994 by The American Society of Mechanical Engineers
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