Laboratory Investigation of Non-Darcy Flow through Rounded Porous Materials

Document Type : Research Article

Authors

1 Civil Engineering, Faculty of Engineering, Yasouj University; Yasouj, Iran

2 Soil Science, Agricultural College, Yasouj University; Yasouj, Iran.

Abstract

Application of aggregate coarse rockfill in hydraulic structures is increasing due to their special ‎properties and is imperative due to its importance and their specific characteristics. Accurate ‎investigation of the flow properties through coarse materials in order to determine hydraulic ‎parameters is one of the most important necessities considering high application such media in civil ‎works. On the other hands, there is less works about transitional flow through coarse materials. In ‎order to study the flow behavior through granular materials a packed column test was built. Some ‎experiments have done on three samples of rounded particles with average size of 10.348mm, ‎‎12.127mm and 17.785mm and seepage flow and upstream and downstream heads were recorded in ‎a certain intervals. By using some calculating and depicting some graphs, their behaviors have ‎evaluated. Using the relationship of flow velocity- hydraulic gradient, it was fund that such ‎relationship is non-linear and this is a strong criteria confirming non-Darcy flow. The evaluating of ‎results of this study by statistical indexes and its comparison by Ergun (1952), Kovacs (1981) and ‎Sidiropoulou et al (2007) relationships showed that the relation of Sidiropoulou et al (2007) is more ‎accurate than the other equations. The result of Reynolds number-friction factor curves has shown ‎that with increasing the grain size diameter, friction factor is decreased and Reynolds number is ‎increased.‎

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References

[1] Izbash, S.V., O filtracii v krupnozernistom materiale. Izv.Nauchno-Issled. Inst. Gidro-Tekh. (N.I.LG.), Leningrad,1931.
[2] Forchheimer, P., Wasserbewegung durch boden. Zeitz. Ver. Duetch Ing., 1901. 45: p. 1782-1788.
[3] Mccorquodale, J.A., A.-A.A. Hannoura, and M. Sam Nasser, Hydraulic conductivity of rockfill. Journal of Hydraulic Research, 1978. 16(2): p. 123-137.
[4] Sedghi-Asl, M., Investigation of the limits of the Dupuit analogue for steady gradually varied flow through coarse porous media. 2010, Ph. D. thesis, Irrigation and Reclamation Engineering, Univ. of Tehran, Tehran (in Persian.)
[5] Ward, J., Turbulent flow in porous media. Journal of the Hydraulics Division, 1964. 90(5): p. 1-12.
[6] Hansen, D., The behaviour of flowthrough rockfill dams.1992: University of Ottawa (Canada)
[7] Ergun, S., Fluid flow through packed columns. Chem.Eng. Prog., 1952. 48: p. 89-94.
Amirkabir Journal of Civil Engineering
Volume 49, Issue 2
August 2017
Pages 295-304

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