Mathematics – Logic
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept..303w&link_type=abstract
In NASA, Washington Repts. of Planetary Geol. and Geophys. Program p 303-304 (SEE N85-23474 13-91)
Mathematics
Logic
Density (Mass/Volume), Mars (Planet), Mars Atmosphere, Mass Transfer, Particles, Venus (Planet), Venus Atmosphere, Wind Effects, Wind Tunnel Tests, Craters, Deposition, Erosion, Morphology, Rates (Per Time), Simulation
Scientific paper
A set of experiments using a wide range of particle densities was performed in an open-circuit, terrestrial-atmospheric-pressure wind tunnel at Arizona State University. The results show that saltation flux equations derived for typical geologic material overpredict the flux of low-density particles. Walnut shells (approximately 1.1 g/cc) were used in the experiment and correspond to volcanic ash or ice. Less mass is transported by the wind in the case of low particle density because the style of transport is different. There is a direct, counter-intuitive relationship between particle density and transport height. Measurements of the vertical distribution of material show that the low-density walnut shells travel in a zone within 10 cm of the surface while high-density (approximately 4.5 g/cc) chromite particles travel as 50 cm. Furthermore, the overall saltation rate of the chromite is approximately four times greater than the walnut shells at the same freestream wind speed, even though the wind is much further above threshold for the walnut shells.
Greeley Ronald
Williams Steven H.
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