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Measurements of Velocity, Velocity Fluctuation, Density, and Stresses in Chute Flows of Granular Materials

机译：颗粒物料溜槽流速，速度波动，密度和应力的测量

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摘要

Experiments on continuous, steady flows of granular materials down an inclined channel or chute have been conducted with the objectives of understanding the characteristics of chute flows and of acquiring information on the rheological behavior of granular material flow. Two neighboring fiber-optic displacement probes provide a means to measure (1) the mead velocity by cross-correlating two signals from the probes, (2) the unsteady or random component of the particle velocity in the longitudinal direction by a procedure of identifying particles, and (3) the mean particle spacing at the boundaries by counting the frequency of passage of the particles. In addition, a strain-gauged plate built into the chute base has been employed to make direct measurement of shear stress at the base. With the help of these instruments, the vertical profiles of mean velocity, velocity fluctuation, and linear concentration were obtained at the sidewalls. Measurements of some basic flow properties such as solid fraction, velocity, shear rate, and velocity fluctuation were analyzed to understand the characteristics of the chute flow. Finally, the rheological behavior of granular materials was studied with the experimental data. In particular, the rheological models of Lun et al. (1984) for general flow and fully developed flow were compared withthe present data.
机译：已经进行了沿着倾斜的通道或斜槽连续，稳定地流动的粒状材料的实验，目的是了解斜槽流动的特性以及获取有关粒状物料流的流变行为的信息。两个相邻的光纤位移探测器提供一种手段来测量（1）通过使来自探测器的两个信号互相关来测量米德速度；（2）通过识别粒子的过程，在纵向方向上，粒子速度的不稳定或随机分量（3）通过计算粒子的通过频率来计算边界处的平均粒子间距。另外，已使用内置于斜槽底座中的应变计板直接测量底座的剪切应力。借助于这些仪器，在侧壁上获得了平均速度，速度波动和线性浓度的垂直分布。分析了一些基本流动特性的测量值，例如固体分数，速度，剪切速率和速度波动，以了解斜道流动的特性。最后，利用实验数据研究了颗粒状材料的流变行为。特别是Lun等人的流变模型。 （1984）的一般流量和充分发展的流量与目前的数据进行了比较。

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