Experimental investigation and kinetic-theory-based model of a rapid granular shear flow

Experimental investigation and kinetic-theory-based model of a rapid granular shear flow
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快速颗粒剪切流的实验研究和基于动力学理论的模型

DOI:
10.1017/s0022112008000700
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发表时间:
2008
影响因子:
3.7
通讯作者:
WILDMAN R
WILDMAN R
中科院分区:
工程技术2区
文献类型:
--
作者:
WILDMAN R

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对理想化的快速剪切颗粒流进行了实验研究,以检验基于干颗粒介质动力学理论的模型的预测。将玻璃球珠放入环形剪切单元中,旋转下边界以引起床中的剪切运动。使用正电子发射粒子跟踪(PEPT)技术跟踪单个粒子,该技术是一种通过放射性示踪粒子发射的伽马光子的三角测量来确定粒子位置的方法。的包装分数和速度场内的三维流进行了测量和比较,使用适用于耗散系统的守恒和平衡方程开发的模型的预测,并解决纳入本构关系来自动力学理论。比较表明,动力学理论是能够捕捉到的一般特征的快速剪切流在很宽的范围内的剪切速率和围压相当不错。
An experimental investigation of an idealized rapidly sheared granular flow was performed to test the predictions of a model based on the kinetic theory of dry granular media. Glass ballotini beads were placed in an annular shear cell and the lower boundary rotated to induce a shearing motion in the bed. A single particle was tracked using the positron emission particle tracking (PEPT) technique, a method that determines the location of a particle through the triangulation of gamma photons emitted by a radioactive tracer particle. The packing fraction and velocity fields within the three-dimensional flow were measured and compared to the predictions of a model developed using the conservation and balance equations applicable to dissipative systems, and solved incorporating constitutive relations derived from kinetic theory. The comparison showed that kinetic theory is able to capture the general features of a rapid shear flow reasonably well over a wide range of shear rates and confining pressures.
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