Velocity and Concentration Distributions in Sheet Flow above Plane Beds
Publication: Journal of Hydraulic Engineering
Volume 125, Issue 2
Abstract
This paper reports the results of experiments on particle-water flow over plane-topped stationary beds. The particles used were silica sands having d50 of 0.30 and 0.56 mm and Bakelite particles having d50 of 1.05 mm. The facility was a recirculating loop with pipe of 105-mm internal diameter. Data comprised measurements of hydraulic gradient, volumetric discharge, temperature, concentration profiles, velocity profiles, and delivered concentrations. The thickness of the sheet-flow layer is found to vary in proportion to the shear stress. The velocity at the top of the layer is found to be ∼9.4 times the shear velocity, and a simple relation expresses the velocity gradient at this height. The Richardson number at the top of the sheet flow averages ∼0.035, decreasing with increasing ratio of particle fall velocity to shear velocity.
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Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 125 • Issue 2 • February 1999
Pages: 117 - 125
History
Published online: Feb 1, 1999
Published in print: Feb 1999
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