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Measurements of velocity and pressure of a collapsing granular pile
Xu, Xiaorong1; Sun, Qicheng1; Jin, Feng1; Chen, Yanpei2
2016-12-01
发表期刊POWDER TECHNOLOGY
ISSN0032-5910
卷号303期号:DEC页码:147-155
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.

关键词Granular Flow Velocity Distribution Packing Fraction Pressure Evolution
文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1016/j.powtec.2016.09.036
收录类别SCI
语种英语
关键词[WOS]FLOW ; DEM
WOS研究方向Engineering
WOS类目Engineering, Chemical
项目资助者National Natural Science Foundation of China(11272048 ; fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology ; 51239006 ; 11572178)
WOS记录号WOS:000386410900017
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/21573
专题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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