高浓度固液两相流的运动特性研究

利用固体颗粒运动的动理论，通过改变颗粒浓度可以考察非粘性颗粒在水流中运动的典型微观和宏观运动特性。本文分别对微观的颗粒速度分布函数变化和由此衍生的诸如颗粒平均速度、颗粒脉动速度和单位体积颗粒数垂线分布等宏观变量的变化进了系统比较。研究结果表明：动理论能够比传统理论获得理详细的微观和宏观信息，也更适合研究高浓度固液两相流运动特性，颗粒运动微观和宏观特性在颗粒浓度超过一定阈值后会发生本质的变化，但临界颗粒浓度值（阈值）在不同的计算和实验条件下会有一定的差别。

Some aspects of hyper-concentrated sediment-laden flows

Some typical characteristics of hyper-concentrated sediment-laden flows are evaluated using kinetic theory.Both microscopic and macroscopic characteristics of sediment motion are investigated by changing the concentration of cohesionless sediment particles.The variation of microscopic particle velocity distribution function and sequential macroscopic variations of characteristics including mean velocity of particles,peculiar velocity of particles and verticla distribution of particle amount per unit vloume are discussed respectively.The study shows that the kinetic theory reveals more detailed microscopic and macroscopic information than conventional theory and suitable for study on characteristics of hyper-concentrated two-phase slow.Whereas,the critical concentration may not be the same value under different conditions of calculation and experiment.