Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...300..597c&link_type=abstract
Astronomy and Astrophysics, v.300, p.597
Astronomy and Astrophysics
Astrophysics
4
Comets, Drag, Dust, Heat Transfer, Meteoroids, Molecular Clusters, Rotating Bodies, Sublimation
Scientific paper
General expressions are derived for the resistive force, the torque, and the mass and heat transfer rates applicable to small bodies - icy grains, droplets, aerosols, or large molecular clusters - in general motion (rotation and translation) across a polyatomic vapour with which they exchange molecules by condensation or evaporation. These expressions, which are valid only for bodies much smaller than the vapour collision mean free path, can also be used to compute the perturbation of a vapour by a dilute population of small condensing or sublimating bodies in motion across it. The particular case of spherical, isothermal, non-rotating bodies is discussed in detail. The present results are, in particular, of interest to the modelling of the inner comas of active comets
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