Xu Weijiang, Che Defu, Xu Tongmo
(School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China)
Abstract: The relaxation process is experimentally investigated by a high-speed camera
in a wind tunnel to reveal the particles motion under unsteady conditions. The results
show an obviously different velocity feature of sand particles from spherical ones at
initial stage of particle-accelerated movement due to the quite distinguishable shapes,
and that the Basset force has no evident influence on the relaxation process. Stokes
number is introduced in this investigation to evaluate the motion types of sand particles.
Keywords: relaxation process; wind tunnel; drag force; Stokes number
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