Heat Transfer and Thermal Treatment Processes in Subterrene-Produced Glass Hole Linings

摘要

Glass-forming and thermal treatment processes for the glass liners of bore holes produced by Subterrene rock-melting penetrators are considered. Analytical and numerical calculations of the radial temperature distributions and glass cooling rates are reported for the glass-like liners created by laboratory penetrators operating in local Los Alamos tuff and basalt. The temper¬ature calculations are compared with experimental data. The cooling rate at the inside surface of the glass liner is strongly influenced by the penetrator afterbody and stem design. To mini¬mize residual stresses in the cooled glass, a qualitative corre-lation is found between this cooling rate and the thermal prop¬erties of the parent rock. The magnitude of residual strains and stresses in glass produced by laboratory penetrators is estimated.