Revisited Analysis of Pressure Drop in Flow through Crushed Rocks
Publication: Journal of Hydraulic Engineering
Volume 128, Issue 11
Abstract
Experimental data of pressure drop in flow through crushed rocks are reanalyzed with the capillary model in comparison with a model based on the square root of permeability as characteristic length. The capillary model is described by two parameters: the pore diameter and the tortuosity. The comparison leads to relationships between the structural parameters, Reynolds number, and friction factor of each model. The interest of the capillary model is that a single equation can predict all the experimental data expressed in terms of a pore friction factor as a function of pore Reynolds number. The equation, which is the sum of a viscous term and an inertial one, is valid for the whole Reynolds number domain. The equation can be used for the determination of the limits of the Darcy and turbulent flow regimes. According to the criterion used to neglect the viscous or the inertial term, the flow regimes limits can be expressed by a simple numerical value.
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Published In
Journal of Hydraulic Engineering
Volume 128 • Issue 11 • November 2002
Pages: 1027 - 1031
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Oct 25, 2000
Accepted: Apr 26, 2002
Published online: Oct 15, 2002
Published in print: Nov 2002
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