Nonlinear Flow through a Packed-Column Experiment
Publication: Journal of Hydrologic Engineering
Volume 20, Issue 9
Abstract
In order to investigate the behavior of flow through granular materials, a packed column test was employed. The laboratory model consisted of a permeameter having 0.2 m diameter and 1 m length. Two kinds of crushed and rounded gravel particles with six different sizes were used as porous materials. By using flow velocity–hydraulic gradient relationships, it was observed that the relationships between velocity and hydraulic gradient are nonlinear and why it is called non-Darcy flow. Evaluating the results of this research for both kinds of aggregates by means of statistical indicators and comparison of different relationships showed the best empirical equation. The relation between Reynolds number and diameter of materials indicated that the friction factor for higher Reynolds numbers decreased and reached to a constant value for both kinds of materials.
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Acknowledgments
The authors wish to express their deepest gratitude to Yasouj University for their financial and technical support of the project.
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Published In
Journal of Hydrologic Engineering
Volume 20 • Issue 9 • September 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 2, 2014
Accepted: Dec 3, 2014
Published online: Jan 19, 2015
Discussion open until: Jun 19, 2015
Published in print: Sep 1, 2015
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