![Civil and Environmental Engineering Department](../../assets/md5images/04669f5fa20678f5bc0ae0fc99655d98.png)
Civil and Environmental Engineering Publications
Take-off threshold velocity of saltating particles under heat radiation
Document Type
Article
Publication Date
2002
Journal
EXPERIMENTS IN FLUIDS
Volume
33
Issue
2
First Page
288
URL with Digital Object Identifier
https://doi.org/10.1007/s00348-002-0426-7
Last Page
295
Abstract
A wind tunnel and a heating device were designed in order to study the influence of solar radiation on the wind-induced motion of solid particles. Velocity and temperature measurements in the boundary layer exhibited clear modifications of flow characteristics with a surprising balance between the viscosity increase and the reduction in the wall velocity gradient. This induces a constant critical wall shear stress under heat flux. Measurements of threshold velocity undertaken to elucidate the possible effects of solar radiation through the increase in turbulence intensity showed a reduction in critical free-stream velocity as the free-stream turbulence increased.