| Shape of free-fall arch in quasi-2D silo |
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| 作者姓名： | Qi Wang Quan Chen Ran Li Gang Zheng Ren Han Hui Yang |
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| 作者单位： | School of Optical-Electrical and Computer Engineering;School of Medical Instrument and Food Engineering |
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| 基金项目： | This study was supported by the National Natural Science Foundation of China(Grant Nos.91634202,12072200,12002213);the Natural Science Foundation of Shanghai(20ZR1438800);Science and Technology Commission of Shanghai Municipality(19142201500). |
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| 摘 要： | In this study,the optical flow method is used to measure the velocity distribution of a granular flow in a rectangular quasi-two-dimensional silo.Using the velocity gradient,a free-fall arch(FFA)is obtained and its geometric characteristics are calculated.A parabola-shaped FFA structure is discovered above the orifice in the steady flow state.The shape of the FFA affects the flow rate through the orifice.Furthermore,as jamming begins to occur,the geometry of the FFA disappears gradually from both sides and then from the middle;finally,the FFA disappears completely in the state of jamming.As the boundary between finite-stress and stress-free regions,the FFA facilitates further studies regarding the discontinuity of the stress area above the orifice.
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| 关 键 词： | Granular flow Optical flow method Velocity field Free-fall arch Flow rate Jamming |
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