Mechanisms of particle vertical diffusion in sediment-laden flows

被引：0
|
作者：
WANG Guangqian
FU Xudong Key Lab for Water and Sediment Sciences of Ministry of Education
机构：
来源：
ChineseScienceBulletin | 2004年 / 10期
关键词：
sediment; two-phase flows; kinetic model; diffusion coefficicnt; lift force;
D O I：
暂无
中图分类号：
P512.2 [剥蚀作用、搬运作用、沉积作用];
学科分类号：
摘要：
Diffusion coefficient of natural sediments andeffects of lift force and gradient in particle velocity fluctua-tions were investigated through using a closed kinetic model.Comparison against experimental data of Einstein & Chien(1955) validated the model. The diffusion coefficient εofmedium and large sediments distinctly exceeds fluid eddyviscosity v~t, while εof fine sediments approximately equalsv~t.In the measured region of 0.03<y/H<0.4, ε/v~t increaseswith the distance from the wall decreasing. Combined effectsof lift force and gradient in particle velocity fluctuationschange sediment gravitational settling remarkably belowy/H=0.2, and need to be accounted for describing sedimentdiffusion in this region.
引用
收藏
页码：1086 / 1090
页数：5
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