Computer Science
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..201d&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.201
Computer Science
Scientific paper
Experiments showed that dust beds continuously eject small, micron sized particles under illumination at mbar pressure [3, 6]. Temperature gradients within the illuminated dust bed induce forces (photophoresis, Knudsen compressor effects) which eject surface particles. We discovered in microgravity experiments that this effect is not linear with gravity (g-levels) but follows a 1/g-function and hence is very efficient at small g-accelerations. The ejection mechanism helps to solve the problem of lifting dust on Mars. At the low atmospheric pressures (mbar) on Mars wind speeds are in general to low to lift dust particles by gas drag alone [2, 5] . Wurm et al. (2008) [7] reported that photophoretic particle ejections actually work on Mars. In this presentation the results of microgravity particle ejection experiments are presented.
de Beule C.
Jankowski T.
Kelling Thorben
Teiser Jens
Wurm Gerhard
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