Experimental investigation of the interaction between weak shock waves and granular layers

• Published in: Experiments in fluids Vol. 22; no. 5; pp. 432 - 443
• Main Authors: BEN-DOR, G, BRITAN, A, ELPERIN, T, IGRA, O, JIANG, J. P
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 17.03.1997; Berlin
• Subjects: Compressible flows; shock and detonation phenomena; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Granular solids; Material form; Physics; Rheology; Shock-wave interactions and shock effects; Shock-wave interactions and shockeffects; Shock waves; Compressive stress; Test facilities; Pressure wave; Wave propagation; Granular materials; Interactions; Experimental study
• ISSN: 0723-4864; 1432-1114
• DOI: 10.1007/s003480050069

The paper describes new experimental results regarding the pressure fields in front of and inside granular layers of different materials during their collision with weak shock waves. A variety of waves result from the shock wave-granular layer interaction. The pressure behind the reflected wave from the material interface approaches the equilibrium value, which would have been reached had the shock wave reflected from a solid end-wall. The wave succession inside the layer depends solely on two processes: the complex interaction of the compaction wave with the granular material and the gas filtration, which affects the particles by the drag forces between the two phases. Inside a material with a permeability coefficient, f, greater than 0.001 sq mm, the transmitted wave moves with a constant velocity which is largely governed by the gas filtration. For low permeability materials (f less than 0.0003 sq mm), the transmitted wave trajectory strongly depends on the compaction wave propagation. In such cases the compaction wave was found to be unsteady, and its acceleration was higher in material having low material densities. (Author)