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.
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Pajot, .F., Ould el Moctar, .A., Dupont, .P. et al. Take-off threshold velocity of saltating particles under heat radiation. Exp Fluids 33, 288–295 (2002). https://doi.org/10.1007/s00348-002-0426-7
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DOI: https://doi.org/10.1007/s00348-002-0426-7