开口角度对二维颗粒流稀疏流-密集流转变的影响

Effect of opening angle on dilute-dense flow transition in two-dimensional granular flow

用计算机模拟的方法研究了开口角度对二维颗粒流稀疏流—密集流转变的影响.在固定入口流量和固定颗粒数两种条件下,均发现当开口角度大于零时,开口角度的增大可以提高颗粒流由稀疏流向密集流转变的最大出口流量.在稀疏流状态下,出口流量与开口角度无关;而在密集流状态下,出口流量随开口角度的增大而增大.进一步的计算还发现增加开口角度可以提高颗粒流出开口的流动速度,且最大出口流量与颗粒的流动速度呈线性关系.

Computer simulations are performed to investigate the effect of opening angle on dilute-dense flow transition in a twodimensional granular flow.Two methods,i.e.the fixed inflow rate and the fixed particle number,are adopted.Both results show that larger opening angle results in an increase of maximum outflow rate in dilute-dense flow transition when the opening angle is larger than zero.When granular flow keeps a dilute flow,the outflow rate is irrelative with the opening angle.When the flow becomes a dense flow,the dense flow rate inereases with opening angle increasing.Further studies show that the granules flow out with a higher velocity when the opening angle increases.The linear relationship between maximum outflow rate and granule flow velocity is observed.