Experimental determination of temperature profiles in a sheared granular bed containing two and three sizes of particles

Experimental determination of temperature profiles in a sheared granular bed containing two and three sizes of particles
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含有两种和三种尺寸颗粒的剪切颗粒床中温度分布的实验测定

DOI:
10.1007/s10035-012-0331-6
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发表时间:
2012
期刊:
影响因子:
2.4
通讯作者:
Wildman R
Wildman R
中科院分区:
工程技术3区
文献类型:
--
作者:
Wildman R

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本文介绍了一种测量剪切低密度颗粒床中颗粒温度的实验方法。使用正电子发射粒子跟踪,从不同尺寸的相位跟踪单个粒子。从坐标数据,在每个方向上的平均流的速度波动的二阶矩被确定。发现较大的粒子“较热”,大部分能量包含在θ(剪切)方向的波动中。克努森层和高阶伯内特效应的证据被发现,这表明扩展的Navier-Stokes方法是必要的,以描述多分散系统中的热传输。
An experiment to measure granular temperature in a sheared low density granular bed containing a range of sizes of particles has been performed. Using positron emission particle tracking, a single particle was tracked from different size phases. From the coordinate data, the second moment of the velocity fluctuations about the mean flow in each direction was determined. It was found that the larger particles are “hotter” and that most of the energy is contained in theθ(shearing) direction fluctuations. Evidence was found for Knudsen layer and higher order Burnett effects, suggesting extensions of the Navier-Stokes approaches are necessary to describe heat transport in polydisperse systems.
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