On pore size and fracture in gas-laden comet nuclei

Details On pore size and fracture in gas-laden comet nuclei On pore size and fracture in gas-laden comet nuclei

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..106..499p&link_type=abstract

Icarus, vol. 106, p. 499

Computer Science

28

Comet Nuclei, Ice, Cometary Atmospheres, Halley'S Comet, Crack Propagation, Porosity, Brittleness, Tensile Stress, Knudsen Flow, Crystallization, Gaseous Diffusion

Scientific paper

A model is used to trace the evolution of a gas-laden, porous comet nucleus composed of amorphous ice; pressure and temperature gradients lead to gas release as the ice crystallizes. Attention is given to the mechanism of pore-widening, which releases pressure to regain stability. Depending on the values of the problem parameters, pores of several mm to a few cm open throughout the crystalline ice layer. Ultimately, very wide channels open whose gas drainage may appear as a jet.

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