Computer Science
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..932g&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Computer Science
Scientific paper
The interaction between solar radiation and cometary surface leads to a sublimation of the icy constituents and erodes the comet's nucleus. This effect depends strongly on the energy absorption of the cometary nucleus. To investigate the sublimation process and the heat transport on comets under solar radiation, we constructed a simulation experiment consisting of a porous ice-dust aggregate mixture under space conditions during perihelion passage. The dust aggregates show high porosities and low tensile strength like cometary material. A cooling system provides cryogenic temperature corresponding to a cold cometary interior. To calculate the heat conductivity we measure the spatial and time dependent temperature distribution of the icedust sample with thermopile sensors and an infrared camera without contact. Furthermore, the sublimation rate, the mass size and velocity distribution of dust ejecta can be measured. We intend to vary the porosity, the thickness of a dry dust layer on top of our sample and the particle size of our dust aggregates. Furthermore the chemical composition of the icy constituents can be changed as the irradiated flux adjusted to simulate different distances to the sun. A complement numerical model describing the transfer processes and energy deposition into the icy porous media is developed. The experimental progress and first outputs as well as the corresponding results of numerical simulations will be presented.
Blum Jacques
Gundlach Bastian
Skorov J.
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