Other
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976icar...29..381i&link_type=abstract
Icarus, vol. 29, Nov. 1976, p. 381-393. Research supported by the Iowa State University of Science and Technology and NASA.
Other
44
Atmospheric Density, Dust Storms, Mars Atmosphere, Particle Interactions, Surface Roughness Effects, Wind Tunnel Tests, Environment Simulation, Particle Size Distribution, Reynolds Number, Thresholds, Wind Effects
Scientific paper
Results are reported for wind-tunnel experiments performed to determine the threshold friction speed of particles with different densities. Experimentally determined threshold speeds are plotted as a function of particle diameter and in terms of threshold parameter vs particle friction Reynolds number. The curves are compared with those of previous experiments, and an A-B curve is plotted to show differences in threshold speed due to differences in size distributions and particle shapes. Effects of particle diameter are investigated, an expression for threshold speed is derived by considering the equilibrium forces acting on a single particle, and other approximately valid expressions are evaluated. It is shown that the assumption of universality of the A-B curve is in error at very low pressures for small particles and that only predictions which take account of both Reynolds number and effects of interparticle forces yield reasonable agreement with experimental data. Effects of nonerodible surface roughness are examined, and threshold speeds computed with allowance for this factor are compared with experimental values. Threshold friction speeds on Mars are then estimated for a surface pressure of 5 mbar, taking into account all the factors considered.
Greeley Ronald
Iversen James D.
Pollack James B.
White Roscoe B.
No associations
LandOfFree
Saltation threshold on Mars - The effect of interparticle force, surface roughness, and low atmospheric density does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Saltation threshold on Mars - The effect of interparticle force, surface roughness, and low atmospheric density, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Saltation threshold on Mars - The effect of interparticle force, surface roughness, and low atmospheric density will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1726044