Accession Number : AD0772531

Title :   An Experimental Study of the Reverse Percolation Lofting Process in a Sand Medium.

Descriptive Note : Final rept.,

Corporate Author : WHITTAKER CORP NORTH HOLLYWOOD CA SHOCK HYDRODYNAMICS DIV

Personal Author(s) : Zernow, Louis ; Louis, Nick ; Andersen, W. Hoyt ; Blatz, Paul J.

Report Date : 16 NOV 1973

Pagination or Media Count : 107

Abstract : A vertical shock tube was used to approximate the time dependent overpressure at 1 km from a nominal 1 Mt source, in order to study the lofting response of a porous sand medium, arising from the gas flow into and out of the medium. The basic shock wave form applied to the sand surface in the vertical shock tube, had a peak value of 100 psig, and a positive duration of approximately 0.75 seconds. The corresponding Brode function has an estimated positive duration of 1.1 sec, but was closely approximated by the experimental shock over the first 0.4 microseconds. (Modified author abstract)

Descriptors :   *SURFACE BURST, *OVERPRESSURE, *SAND, *PERCOLATION, PERMEABILITY, POROSITY, PRECURSORS, SHOCK WAVES, SHOCK TUBES.

Subject Categories : Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE