ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Avalanching patterns of irregular sand particles in continual discrete flow |
Ren Han(韩韧)1, Yu-Feng Zhang(张宇峰)1, Ran Li(李然)2, Quan Chen(陈泉)1, Jing-Yu Feng(冯靖禹)1, Ping Kong(孔平)3 |
1 School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; 2 School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; 3 Shanghai Key Laboratory for Molecular Imaging, Department of Science and Liberal Art, Shanghai University of Medicine and Health Sciences, Shanghai 201318, China |
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Abstract We investigate the flow patterns 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 flow, we find a type of avalanching pattern of irregular sand particles which is similar to that of spherical particles flow. Due to the fact that the initial position of avalanche in this pattern locates at the middle of the drum and the avalanche propagates toward the edge area gradually, we named it as mid-to-edge avalanching pattern. Furthermore, we find another avalanching pattern which slumps from the edge and propagates toward the opposite edge of the flow surface, named as edge-to-edge pattern. By analyzing the temporal and spatial characteristics of these two types of avalanching patterns, we discover that these two types of avalanche patterns are caused by that the avalanching particles constantly perturb the axial adjacent particles. Thus, the particles on the flow surface are involved in avalanching sequentially in order of the axial distance from the initial position.
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Received: 21 October 2019
Revised: 09 November 2019
Accepted manuscript online:
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PACS:
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45.70.Ht
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(Avalanches)
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45.70.Mg
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(Granular flow: mixing, segregation and stratification)
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43.58.Fm
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(Sound level meters, level recorders, sound pressure, particle velocity, And sound intensity measurements, meters, and controllers)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11572201, 91634202, and 11902190). |
Corresponding Authors:
Ping Kong
E-mail: kongp@sumhs.edu
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Cite this article:
Ren Han(韩韧), Yu-Feng Zhang(张宇峰), Ran Li(李然), Quan Chen(陈泉), Jing-Yu Feng(冯靖禹), Ping Kong(孔平) Avalanching patterns of irregular sand particles in continual discrete flow 2020 Chin. Phys. B 29 024501
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