We have examined the momentum transfer when a shock wave interacts with a dry aqueous foam. Two physical mechanisms have been pointed out. The first concerns the fragmentation model. A pressure threshold has been determined which carac-terises the degree of heterogeneity of the foam. The second issue concerns the two phase-phase momentum transfer. We have shown that the momentum transfer in the foam must be treated with two different drag coefficient laws according to the different phases of the foam transformation: acceleration of the foam ligaments after fragmentation (modified Stokes law) and spherical droplets dynamics. The authors thank S. Faure of CEA Marcoule for designing the foam generator.
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