EFFECT OF FLOW CONDITIONS ON 3D MOVEMENT CHARACTERISTICS OF PARTICLES  

作　　者：Limo TANG Shanghong ZHANG Mingzhong YU Xingkui WANG 

机构地区：[1]State Key Laboratory of Hydroscience and Engineering, Tsinghua University. Beijing, 100084, China

出　　处：《International Journal of Sediment Research》2006年第4期272-280,共9页国际泥沙研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.50279013&No.50221903).

摘　　要：In steady uniform flows with different water depths, experiments with single particles were performed using a Particle Tracking Velocimetry （PTV） technique, and then the mechanism of particle movement was studied statistically. The experimental results showed that the average longitudinal velocity profile of particles conformed to the Log-law. The mean Von Karrnan constant, k, was 0.393, and the streamwise velocity of particles was lower than that in clear water flow by a ratio of 0.826. The vertical distribution of particle concentration in the suspended load region agreed with the Rouse equation, and the average value of the compensation factor, β, was determined to be 1.50. The turbulence intensity of the particle fluctuation velocity decreased with the increase in the Reynolds number Re.In steady uniform flows with different water depths, experiments with single particles were performed using a Particle Tracking Velocimetry （PTV） technique, and then the mechanism of particle movement was studied statistically. The experimental results showed that the average longitudinal velocity profile of particles conformed to the Log-law. The mean Von Karrnan constant, k, was 0.393, and the streamwise velocity of particles was lower than that in clear water flow by a ratio of 0.826. The vertical distribution of particle concentration in the suspended load region agreed with the Rouse equation, and the average value of the compensation factor, β, was determined to be 1.50. The turbulence intensity of the particle fluctuation velocity decreased with the increase in the Reynolds number Re.

关 键 词：Coarse particles Water depth 3D movement PTV technique 

分 类 号：TV142.3[水利工程—水力学及河流动力学]