Physics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...89...73k&link_type=abstract
Icarus (ISSN 0019-1035), vol. 89, Jan. 1991, p. 73-84.
Physics
9
Comet Nuclei, Cracks, Energy Transfer, Halley'S Comet, Ice Nuclei, Mass Transfer, Free Flow, Gas Flow, Molecular Flow, Surface Properties, Comets, Ice, Mass, Energy, Transport, Sublimation, Cracks, Models, Comet Nuclei, Gases, Flow, Parameters, Temperature, Flux, Condensation, Porosity, Heating, Cooling, Calculations, Geometry
Scientific paper
A model is developed for the mass and energy transport characteristics of the gas in a rectangular crack of arbitrary depth and cross section on a cometary surface, under the assumptions that the gas sublimates from the walls according to the local ice temperature and that the molecules hitting the ice walls recondense there. The sublimation rate from an icy surface with many small pores is found to be virtually the same as in the case of a flat surface; the existence of a few larger holes which lead to the same total pore cross section, however, can drop the surface sublimation rate to 80 percent. Gaps will constitute a major emission source if an inward-increasing temperature profile occurs in the ice. An additional major factor is cooling by net sublimation from the ice walls.
Dettleff G.
Kömle Norbert I.
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