Description: Results of calculations to predict heat losses to surrounding rock for Subterrene rock-melting penetrators of various shapes are presented in nondimensional form that can be applied to a range of axisymmetric penetrator geometries. Theoretical upper and lower limits are placed on a dimensionless time parameter, which includes penetrator dimensions, rock properties, and penetration rate. At these limits, heat losses either approach zero or are unaffected by penetrator geometry and velocity. The estimated heat losses from the nondimensional parameters agree well with experimental data and numerically calculated results. (auth)
Date: October 1, 1973
Creator: Cort, G.E.
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