Experimental study on three dimensional movements of particles Ⅰ Effects of particle diameter on velocity and concentration distributions  

作　　者：Limo TANG Xingkui WANG 

机构地区：[1]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China [2]State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China

出　　处：《International Journal of Sediment Research》2009年第2期159-168,共10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);the Science and Technology Innovation Foundation of Hohai University (2006406711)

摘　　要：Based on the three Dimensional Particle Tracking Velocimetry （3D PTV） system, the characteristics of motion of particles with four different diameters were investigated under the steady flow conditions The longitudinal average velocity profiles of these particles were in accordance with Log-law, while the vertical and transverse velocities remained very low with minimal fluctuation. The time-average velocity of particles in the bed load layer was 8.50u., close to Bagnold＇s assumptionUn -60. The vertical concentration distribution of particles in the suspension region agreed with the Rouse equation. When the diameter of particles was relatively large, there existed an evident concentration gradient in the bed load layer.Based on the three Dimensional Particle Tracking Velocimetry （3D PTV） system, the characteristics of motion of particles with four different diameters were investigated under the steady flow conditions The longitudinal average velocity profiles of these particles were in accordance with Log-law, while the vertical and transverse velocities remained very low with minimal fluctuation. The time-average velocity of particles in the bed load layer was 8.50u., close to Bagnold＇s assumptionUn -60. The vertical concentration distribution of particles in the suspension region agreed with the Rouse equation. When the diameter of particles was relatively large, there existed an evident concentration gradient in the bed load layer.

关 键 词：Particle diameter 3D movement VELOCITY CONCENTRATION 

分 类 号：TP302.4[自动化与计算机技术—计算机系统结构] TP391.41[自动化与计算机技术—计算机科学与技术]