|Vertical mixing in the fully developed turbulent layer of sediment-laden open-channel flow|
In: Journal of Hydraulic Engineering. American Society of Civil Engineers (ASCE): New York, NY. ISSN 0733-9429; e-ISSN 1943-7900
Physics > Mechanics > Fluid mechanics
Physics > Mechanics > Fluid mechanics > Fluid dynamics
Physics > Mechanics > Hydraulics
Eulerian equations for the vertical flux and momentum of suspended particles in dilute sediment-laden open-channel flow in equilibrium have been derived using the two-fluid approach. Reynolds averaging has been applied in order to allow validation of individual terms with experimental data. Consideration of the various terms of the vertical momentum balance with experimental flume data indicates that the drag force has to be separated into a mean and a turbulent contribution with different timescales, respectively, the (gravitational) particle timescale and the integral turbulence timescale. The resulting formulation further provides a new theoretical closure for the turbulent Schmidt number.