【摘 要】
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We investigate the fl ow pattes of irregular sand particles under avalanching mode in a rotating drum by using the spatial filtering velocimetry technique. By e
【机 构】
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School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Techno
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We investigate the fl ow pattes of irregular sand particles under avalanching mode in a rotating drum by using the spatial filtering velocimetry technique. By exploring the variations of velocity distribution of granular fl ow, we find a type of avalanching patte of irregular sand particles which is similar to that of spherical particles fl ow. Due to the fact that the initial position of avalanche in this patte locates at the middle of the drum and the avalanche propagates toward the edge area gradually, we named it as mid-to-edge avalanching patte. Furthermore, we find another avalanching patte which slumps from the edge and propagates toward the opposite edge of the fl ow surface, named as edge-to-edge patte. By analyzing the temporal and spatial characteristics of these two types of avalanching pattes, we discover that these two types of avalanche pattes are caused by that the avalanching particles constantly perturb the axial adjacent particles. Thus, the particles on the fl ow surface are involved in avalanching sequentially in order of the axial distance from the initial position.
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