Computer Science
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..515k&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 39, March 1991, p. 515-524.
Computer Science
10
Comet Nuclei, Computerized Simulation, Ice, Sublimation, Surface Temperature, Light Curve, Light Sources, Planetary Crusts, Vapor Pressure, Comets, Simulations, Laboratory Studies, Experiments, Sublimation, Ice, Crust, Comet Nuclei, Gases, Emissions, Porosity, Mantle, Temperature, Dust, Vapor Pressure, Heating, Conduction, Procedure, Diagrams, Calculations, Energy, Structure, Comparisons, Diffusion, Timescale
Scientific paper
Dust mantles or nonvolatile mineral crusts most probably exist on large parts of the surface of many cometary nuclei. Even when such a layer is only a few mm thick and porous, its existence reduces substantially the gas emission rate of the underlying ice. The present paper reports the results of systematic laboratory experiments, where a sample of porous granular ice covered by a dark steel plate with holes was irradiated under vacuum conditions by an artificial light source simulating the sun. The plate was intended to simulate the effect of a porous nonvolatile cometary crust or dust mantle. The build-up of vapor pressure below the artificial crust and the temperature profile developing in the ice sample were determined for different hole sizes. In all experiments a drastic reduction of the gas emission rate (compared with the case of free sublimation from a dark icy surface of the same albedo and emissivity) was observed. The main effect of the porous crust is a much faster heating of the underlying ice due to suppression of gas outflow. The experimental results are interpreted in terms of a new heat conduction model that allows for all conduction modes that may act in such a structured ice, in particular Knudsen gas diffusion, IR radiation, and solid-state heat conduction via intergranular connection points.
Baguhl Michael
Dankert Christoph
Dettleff G.
Hellmann H.
Kochan Hermann
No associations
LandOfFree
Ice sublimation below artificial crusts - Results from comet simulation experiments does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Ice sublimation below artificial crusts - Results from comet simulation experiments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ice sublimation below artificial crusts - Results from comet simulation experiments will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-937492