Improvements in hydrodynamic models of Comet Halley dusty atmosphere: Initial boundary conditions and homogeneous nucleation

Details Improvements in hydrodynamic models of Comet Halley dusty atmosphere: Initial boundary conditions and homogeneous nucleation Improvements in hydrodynamic models of Comet Halley dusty atmosphere: Initial boundary conditions and homogeneous nucleation

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.533c&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 533-538 (SEE N87

Physics

1

Boundary Conditions, Cometary Atmospheres, Cosmic Dust, Dynamic Models, Halley'S Comet, Nucleation, Condensing, Ice, Sublimation, Vaporizing

Scientific paper

Two important effects associated with the solid-gas phase transition assumed to control cometary activity, i.e. nucleus ice sublimation and homogeneous recondensation in the fluid expansion region are reconsidered using appropriate gasdynamic methods: (1) physically consistent expressions are proposed for the assessment of the initial boundary conditions of the fluid expansion region; (2) the classical homogeneous nucleation theory is applied taking into account the presence of dust. It is found that water vapour expands in an initially supersaturated state, contrary to previous assumption. However, due to the convective exchanges between gas and grains, the nucleation rate is much smaller than in the case of pure adiabatic expansion. The implications of these results are discussed and suggestions for future improvements are given.

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