Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p31b0982n&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #P31B-0982
Other
5409 Atmospheres: Structure And Dynamics, 5415 Erosion And Weathering, 6225 Mars, 0305 Aerosols And Particles (0345, 4801), 0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707)
Scientific paper
Laboratory experiments using the Arizona State University Vortex Generator ("dust devil machine") yield new results in simulating the amount of sand and dust (flux) raised by dust devils. Flux experiments involved measuring mass loss from a test bed as a function of time for known vortex parameters yielding a calculated value for the flux. Sediment fluxes of dust (2 μ m in diameter), silica sands (5 sizes ranging in diameter from 90 to 500 μ m), and walnut shells (2 sizes ranging in diameter from 590 to 1700 μ m) are compared to the Reynold's number, u{θ r{θ }/ν } (4000-18,000), and a dimensionless lifting parameter, Δ P/(ρ pgDp), (0.001-1.0), in which u{θ } and r{θ } are the vortex tangential velocity and core radius, ν is the kinematic viscosity of the air, Δ P is the pressure drop across the vortex, ρ p and Dp are the particle density and diameter, and g is gravitational acceleration. Results show that in general, flux increases with Reynold's number and with lifting parameter. Lower-density walnut shells show a higher flux than silica sands and dust suggesting that on Mars (where g is lower) the flux would be greater in comparison to Earth. Lower-density walnut shell particles are used to simulate the lower g of Mars. Future work involves further expansion of the experiment matrix with other materials of varying sizes and densities. Use of the Mars Surface Wind Tunnel facility at NASA Ames Research Center will also allow this study to be simulated at Mars atmospheric pressures.
Balme M. L.
Eddlemon Eric E.
Foley Daniel J.
Greeley Ronald
Iversen James D.
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