【摘要】 为提高输送效率和节约能源 ,使用振动法实现了浆体的输送减阻。尾砂试验表明振动减阻是切实可行的 ,而浆体的浓度和输送速度是两个关键性因素。通过应力波的反射与透射分析 ,认为应力波在管道垂直方向上传播时逐渐衰减 ,迫使下层颗粒向上作微小移动 ,降低了浆体的粘性阻力损失。管道振动对层流附面层有较大影响 ,使边壁浆体的速度梯度减小 ,并导致边壁剪切应力的降低 ;同时使附面层的厚度加大 ,中性稳定雷诺数增加 ,阻止流态的转捩。应力波的作用以及附面层的改变 ,最终导致输送阻力的降低更多还原

【Abstract】 In order to increase transport efficiency and reduce energy consumption, drag reduction is achieved by vibration. The test of tailing transport has shown that vibrating drag reduction is practical and feasible, and slurry density and transportation velocity are its two key factors. By analysizing the reflection and transmission of stress wave, it is concluded that stress wave attenuates gradually as it popagates in the rertical direction of pipeline, forcing lower particles to move upward slightly to reduce viscous drag of slurry. Pipeline vibration has a greater influence on the boundary layer of laminar flow, that is to say, both the velocity gradient of sluryy,and the shearing stress near the edge are reduced. Meantime the thickness of boundary layer and the neutral steady Reynolds number will be increased,preventing reversal of fluid state. Therefore, the action of stress wave and the change of boundary layer make the drag of transportation decrease.更多还原