Thermophoresis and Wind Lifting Particles on Mars: 1st Order Approximation

Physics

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[5405] Planetary Sciences: Solid Surface Planets / Atmospheres, [6225] Planetary Sciences: Solar System Objects / Mars

Scientific paper

Dust devils on Mars have been attributed to the haze in the Martian atmosphere (Balme and Greeley 2006). Numerical simulations of vortices have limited the number of vortices recorded by Viking that could entrain dust particles due to high threshold wind velocity (Ryan and Lucich 1983). Thermophoresis is a process of a momentum transfer from gas to dust particles through changes in the temperature gradient and has been proposed as a contributor to dust lifting on Mars (Wurm and Krauss 2006, Wurm et al 2008). Using IDL, a solid state greenhouse and photophoretic force laser model, similar to Wurm and Krauss 2006, was created. Data from Wurm et al 2008 and Greeley et al 1980 was applied to the model through a series of balancing force equations. The model quantified a new lower limit of velocities for entraining various particle diameters by a change of 44%. These estimates warrant further investigation into using thermophoresis with Mars wind tunnel experimentation. Threshold wind velocities for entrainment before (squares) and after (diamonds) application of Thermophoretic force on variety of particle sizes.
Wind velocities before (stars) and after (triangles) application of Thermophoretic force on variety of particles sizes extrapolated to 1.6 m off the surface on Mars (height of Viking sensors).

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