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ABLATIVE PRESSURE PULSE

preprint
posted on 27.08.2021, 14:02 by Jan GrzesikJan Grzesik
We examine herein a simple model for the evolution in time of the pressure which a suddenly vaporized, ablating layer exerts upon the subjacent body. The model invokes a plausible construct of surface material instantaneously thrust into a gaseous regime governed by a Maxwell-Boltzmann phase space distribution. The surface pressure per se is gotten by computing the time rate of change of the momentum per unit area which the retrograde molecules, and only those, transfer through impact/reflection to the unvaporized body below. An explicit pressure formula, one alluding to the variable gas temperature within the vaporized layer, is obtained as a single quadrature requiring numerical integra- tion at finite times past the onset of impact. Limiting, null pressure values, both close-in and in pulse aftermath, can nevertheless be extracted in analytic terms, confirming in particular the indispensable asymptotic evanescence. A universal formula in dimensionless variables is given for pressure versus time, both suitably normalized.

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History

Email Address of Submitting Author

jan.grzesik@hotmail.com

ORCID of Submitting Author

0000-0002-7084-8678

Submitting Author's Institution

Allwave Corporation, 3860 Del Amo Boulevard, Suite 404, Torrance, CA 90503

Submitting Author's Country

United States of America