Mechanisms of particle vertical diffusion in sediment-laden flows
Mechanisms of particle vertical diffusion insediment-laden flows

Diffusion coefficient of natural sediments and effects of lift force and gradient in particle velocity fluctuations were investigated through using a closed kinetic model. Comparison against experimental data of Einstein & Chien (1955) validated the model. The diffusion coefficient eyy of medium and large sediments distinctly exceeds fluid eddy viscosity n tf, while eyy of fine sediments approximately equals n tf. In the measured region of 0.03