瓶颈开口角对二维颗粒流的影响

实验研究了平面传送带上颗粒流的特性，主要包括传送带出口处开口宽度以及瓶颈开口角度对颗粒流的影响.实验结果发现，改变瓶颈开口角度θ，当θ大于15°时，颗粒流量Q随着cosθ呈线性变化.同时，颗粒流量Q与传送带速度v以及开口大小R也密切相关，而在θ小于15°时，颗粒流量Q基本不随开口角度变化.

The effect of opening-angle at choke point on the two-dimensional granular flow on a conveyor belt

The relationship between the granular flow rate Q on a two-dimensional conveyor belt and the opening-angle θ at choke point together with the velocity of the conveyor belt and the exit-size has been studied in the experiment. The result shows that the granular flow rate Q is influenced chiefly by the following factors: the exit width R, the speed of the conveyor belt and the opening-angle θ at choke point. The rate of flow Q increases linearly with the speed v and the exit width R, and the rate of flow Q decreases linearly with cosθ when the opening-angle θ is larger than 15° for the dilute granular flow.