Dispersive Force Basis for Concentration Profiles
Publication: Journal of Hydraulic Engineering
Volume 114, Issue 7
Abstract
Sediment concentration measurements of particulate slurry flow provide new insights into intense movement of both bed load and suspended load at high concentrations. The submerged weight of the bed-load (contact-load) solids is transferred downward by means of the normal intergranular stress. Associated with this normal stress there is a granular component of the shear stress resisting motion. Only the remaining, fluid-based, component of the shear stress produces the fluid shear velocity which is involved in velocity distribution and other features of turbulent flow. Turbulent support of suspended load entails a dispersive force which can be evaluated on the basis of the usual flux analysis. This force involves a transfer of weight from the particles to the surrounding fluid, which has been measured experimentally. Combined with the inter-granular stresses mentioned above, this dispersive force gives a new method of linking bed-load and suspended-load components to calculate total-load concentration profiles.
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Published In
Journal of Hydraulic Engineering
Volume 114 • Issue 7 • July 1988
Pages: 806 - 810
Copyright
Copyright © 1988 ASCE.
History
Published online: Jul 1, 1988
Published in print: Jul 1988
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