Gas diffusion in a cometary crust

Details Gas diffusion in a cometary crust Gas diffusion in a cometary crust

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.302..205k&link_type=abstract

In ESA, Physics and Mechanics of Cometary Materials p 205-209 (SEE N90-19989 12-90)

Physics

Comet Nuclei, Cometary Atmospheres, Comets, Dust, Gaseous Diffusion, Knudsen Flow, Monte Carlo Method, Comparison, European Space Programs, Experimentation

Scientific paper

An investigation into the outflow of vapor sublimated from the underlaying ice of a cometary nucleus through the pores of the nonvolatile dust mantle is presented. Some critical comments regarding the validity of the Knudsen diffusion formula, which is generally used for the gas outflow through a cometary dust mantle at low densities, are made. An alternative model for the gas flow through straight capillaries based on a Monte Carlo calculation is presented. The results are compared with those given by the simple Knudsen diffusion formula, and the differences between these two approaches are discussed. The relevance of the Monte Carlo model for the interpretation of recent KOSI (comet simulation) experiments is pointed out.

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