The flowability of granular material is commonly determined from shear cell tests, but in the real world, the granular flow is quite different in many cases. For this paper, the flowabilities in a narrow channel of five different granular materials were investigated. The flow parameters of the granular flows were determined to classify the flowabilities. Granular flow surface velocities and flow heights and thicknesses were measured, and it was found that the mean shear rates in the linear portions of the velocity profiles increase with both flow rates and inclination. A universal parameter, the ratio of the sine of the inclination to the shear rate in the linear part of the velocity profile, is proposed as a constant. This constant is independent of particle properties. In addition, a flowability parameter, the ratio of the mean shear rate to the cosine of the inclination, is proposed to characterize the friction between the particles in the flowing granular material.

粒状材料的流动性通常由剪切室测试确定，但在现实世界中，在许多情况下，粒状流有很大不同。对于本文，研究了五种不同颗粒材料在狭窄通道中的流动性。确定颗粒流的​​流动参数以对流动性进行分类。测量了颗粒流动表面的速度，流动高度和厚度，发现速度分布的线性部分的平均剪切速率随流速和倾斜度的增加而增加。提出一个通用参数，即速度曲线的线性部分中的倾斜正弦与剪切速率的比值作为常数。该常数与颗粒性质无关。另外，流动性参数