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本文着重探讨管道中悬移质与推移质分层流动的阻力特性.文中提出,粗颗粒、高浓度的两相流动中,颗粒间的碰撞力对颗粒的悬浮和运动起着重要的作用.在这个理论基础上,导出了阻力系数公式,并得到验证.试验证明,扩散理论不足以描述这类流动.粗颗粒的悬浮运动是否增耗水流的能量,主要取决于碰撞力与紊动力之间的对比消长.在高浓度情况下,粗颗粒悬移质明显地增大了水流的能量损失.推移质的存在将使两相流动的阻力损失显著增大,其增阻率与水流条件及颗粒特性之间存在有一定的函数关系.
This paper focuses on the resistance characteristics of the suspended and pledged stratified flow in the pipeline.The paper proposed that the collision force between particles plays an important role in the particle suspension and movement in the coarse particles and the high concentration two-phase flow. Based on this theory, the formula of the drag coefficient is deduced and validated. The experimental results show that the diffusion theory is not enough to describe this kind of flow. Whether or not the coarse particles’ floating motion increases the energy of the flow depends mainly on the difference between the collision force and the turbulent force In the high concentration condition, the coarse particle suspended matter obviously increases the energy loss of the water flow, and the presence of pluton will significantly increase the resistance loss of the two-phase flow, and its resistivity, water flow and particle properties There is a certain functional relationship between.