Abstract
Sublimation rate of ice into rarefied gases is studied experimentally between two concentric spheres in the range of sublimating surface temperature of - 50°C- - 30°C, and the range of stagnant gas pressure at the condensing surface of 0-1 mmHg. The results are compared with the analytical results obtained with the two-sided Maxwellian distribution functions. Applying the theoretical results to mass transfer through the gaseous phase, a sublimation coefficient of ice of about 0.3 is obtained near -30°C and 0.7 near -50°C. The effect of the partial pressure of stagnant gas on experimental measurements of the sublimation coefficients is also discussed.
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