【摘要】 实验研究了粗糙边界条件、不同通道宽度以及不同斜面倾斜角下二维颗粒流的颗粒分布 ,发现颗粒流在稀疏流状态下尽管在现象上表现出类似流体的性质 ,但由于颗粒流系统的能量耗散 ,所以颗粒流的速度和密度分布和牛顿流体完全不同 ,颗粒流在通道中的分布既受通道宽度的影响同时也受重力场的影响 ,颗粒在通道中以通道中轴线呈对称分布 ,通道两侧的颗粒密度明显高于通道中间 ,由于通道中颗粒受剪切力的作用 ,导致颗粒在通道中的密度分布的变化 ,通道边界粗糙度明显影响着颗粒流横向分布更多还原

【Abstract】 We have investigated experimentally the two-dimensional flow of stainless steel balls through a smooth inclined plane and between two parallel plates so that the side walls are rough and the inclination is adjustable. It is shown that the dynamical behavior of the dilute granular flow is different from the Newtonian fluids because of the energy dissipation. Compared to the viscous fluids, the velocity profiles of the granular flow are more blunted than the parabolic form and the density profiles are nonuniform. Near the side walls, the density is higher than the center of the channel. The distribution of the density is influenced by increasing inclination and the width of the channel. The transverse distribution of the granules in the channel is affected chiefly by the density distribution.更多还原