Measurements of velocity and pressure of a collapsing granular pile | |
Xu, Xiaorong1; Sun, Qicheng1; Jin, Feng1; Chen, Yanpei2 | |
刊名 | POWDER TECHNOLOGY |
2016-12-01 | |
卷号 | 303期号:DEC页码:147-155 |
关键词 | Granular flow Velocity distribution Packing fraction Pressure evolution |
ISSN号 | 0032-5910 |
英文摘要 | This paper proposes a synchronized measurement method of analyzing collapsing granular piles using a highspeed camera and a grid-based tactile pressure sensor. The method is developed with a pressure sensor comprising 2016 individual sensels and a granular pile consisting of approximately 24,000 ceramsite spheres. Geometric, kinetic, and mechanical quantities (i.e., packing fraction phi, mean speed (nu) over bar, and pressure P) are simultaneously measured for a more detailed analysis of collapse processes. Collapses last for about 33T(C). where the characteristic time T-C = root h(0)/g, h(0) is the initial height of the granular pile, and g is acceleration due to gravity. The failure angle is measured as phi(f)approximate to 51 degrees. The relation between packing fraction and flow speed in mu(I) rheology, which is a previous theoretical predication, is validated in the experimental measurements of this work. Pressure distributions beneath the granular pile are recorded in time. Results show that the probability density function of the scaled contact pressure exhibits the power-law for small stresses, whilst a Gaussian distribution for large pressures beneath the granular pile at the initial state. As the pile is agitated, a large drop in pressure is observed during the stage when many particles fall freely, and pressure propagation is compared with mean speed. (C) 2016 Elsevier B.V. All rights reserved. |
WOS标题词 | Science & Technology ; Technology |
类目[WOS] | Engineering, Chemical |
研究领域[WOS] | Engineering |
关键词[WOS] | FLOW ; DEM |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000386410900017 |
内容类型 | 期刊论文 |
源URL | [http://ir.ipe.ac.cn/handle/122111/21573] |
专题 | 过程工程研究所_多相复杂系统国家重点实验室 |
作者单位 | 1.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China |
推荐引用方式 GB/T 7714 | Xu, Xiaorong,Sun, Qicheng,Jin, Feng,et al. Measurements of velocity and pressure of a collapsing granular pile[J]. POWDER TECHNOLOGY,2016,303(DEC):147-155. |
APA | Xu, Xiaorong,Sun, Qicheng,Jin, Feng,&Chen, Yanpei.(2016).Measurements of velocity and pressure of a collapsing granular pile.POWDER TECHNOLOGY,303(DEC),147-155. |
MLA | Xu, Xiaorong,et al."Measurements of velocity and pressure of a collapsing granular pile".POWDER TECHNOLOGY 303.DEC(2016):147-155. |
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