We first consider this minimum velocity for horizontal flow, the saltation velocity. 首先讨论在水平流动时的最低速度,即沉积速度。
The pressure drop and saltation velocity predicted by the model are in good agreement with the experimental data from literature. 用文献实验得到的压降和转捩速度验证了所建模型和计算方法的正确性。
The calculated results show that the effect of the moving sand in the fluid outside the region to which saltation is confined, is similar to that of solid roughness, and the effective roughness can be depicted as the quadratic function of the friction velocity of the wind. 结果表明,跃移沙粒对风速的影响类似于床面粗糙度的影响,有效粗糙度随摩阻速度的变化关系可用二次函数表征;
The Study of Sand Saltation Movement With High Velocity Cinecamera 沙粒跃移运动的高速摄影研究
The Gas-Solids Suspension Movenment in Horizontal Pipes and Saltation Velocity 水平管内固气悬浮运动和沉积速度
The results show that the model can really simulate the dynamic process of particle-bed interaction in saltation, the particle ejection velocity and angle are very stochastic on multiple-grain size bed. 计算结果表明该模型可以模拟风沙运动中颗粒冲击多粒径床面的动态运动过程。而且在多粒径非均匀床面上的颗粒起跳具有较大的随机性。
The features of saltation was analysed in a continuum viewpoint: the particle phase has relatively fast slip velocity on the bed surface, and it has rather strong vertical velocity fluctuation while the average vertical velocity is exactly zero. 本文还用拟流体观点分析了固相运动的特点:在床面上有较大的滑移速度,有较大的垂向速度脉动,但垂向的平均速度却为零,等等。
Through certain experimental observations, the factors of influence on the saltation velocity and some correlations are reviewed and discussed. 通过一定的实验观察,对影响沉积速度的因素进行了初步分析,并对若干关联式加以评述讨论。