RESEARCH ON HYPERSONIC CONDENSATION PHENOMENA IN HIGH TEMPERATURE GASES. VOLUME II. CONDENSATION EXPERIMENTS in a shock tube.

摘要

Shock tube studies of platinum evaporation and condensation are reported. Platinum was loaded into a shock tube in the form of an aerosol consisting of submicron particles (produced by electrically exploding platinum wire) suspended in an argon or xenon-argon carrier gas. The time required for these particles to evaporate behind a reflected shock was determined by observation of the continuum emission from the particles. The progress of recondensation during a nonsteady expansion was monitored through measurements of light extinction. It was found that shock tube techniques could be used to determine the vapor pressures of refractory metals at high temperatures. (Author)