Physics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000icar..148..594h&link_type=abstract
Icarus, Volume 148, Issue 2, pp. 594-596 (2000).
Physics
7
Scientific paper
Molecules effusing, evaporating, or sublimating from a surface into a void are initially not in equilibrium and therefore do not obey the Maxwell velocity distribution function. Starting with a Maxwell transmission distribution of speeds, we calculate from conservation of momentum and energy the temperature and center-of-mass speed of a drifting Maxwell distribution after equilibrium has been reestablished by collisions in the limit of negligible return flux. The drift (bulk flow) speed corresponds to a Mach number larger than 1. As opposed to effusion, vaporization and sublimation are two-phase processes that restrict the pressure and thus the molecular flux, but without influencing the temperature or bulk flow speed.
Huebner Walter F.
Markiewicz Wojciech J.
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