Two-phase flow insights into open-channel flows with suspended particles of different densities

The effect of particle density on the turbulent open-channel flow carrying dilute particle suspensions is investigated using two specific gravities and three concentrations of solid particles. The particles, identical in size and similar in shape, were natural sand and a neutrally buoyant plastic. T...

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Bibliographic Details
Published in:Environmental fluid mechanics (Dordrecht, Netherlands : 2001) Netherlands : 2001), 2009-04, Vol.9 (2), p.161-186
Main Authors: Muste, M, Yu, K, Fujita, I, Ettema, R
Format: Article
Language:English
Subjects:
Civil engineering
Classical Mechanics
Earth and Environmental Science
Earth Sciences
Environmental Physics
Flow velocity
Hydrogeology
Hydrology/Water Resources
Investigations
Multiphase flow
Oceanography
Open channel flow
Original Article
Particle inertia
Particle size
Particle tracking velocimetry
Reynolds number
Sediments
Specific gravity
Suspended sediment transport
Turbulence
Turbulence modulation
Two-phase flows
Velocity
Water depth
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Summary:The effect of particle density on the turbulent open-channel flow carrying dilute particle suspensions is investigated using two specific gravities and three concentrations of solid particles. The particles, identical in size and similar in shape, were natural sand and a neutrally buoyant plastic. The particles were fully suspended, and formed no particle streaks on the channel's bed. Accordingly, the changes in the flow are attributed to the interactions between suspended particles and flow turbulence structures. Measurements were obtained by means of image velocimetry enabling simultaneous, but distinct, measurement of liquid and particle velocities. The experimental results show that, irrespective of particle specific gravity, particle suspension influences bulk velocity of flow and the Kármán coefficient, while friction velocity essentially remains constant. The results also show that particles in suspension modify local water turbulence over the flow depth, but in ways not accurately predicted using the customary parameters for characterizing turbulence modification.
ISSN:1567-7419
1573-1510
DOI:10.1007/s10652-008-9102-7