%0 Journal Article %T Laboratory Investigation of Non-Darcy Flow through Rounded Porous Materials %J Amirkabir Journal of Civil Engineering %I Amirkabir University of Technology %Z 2588-297X %A Salahi, M.B %A Parvizi, M. %A Sedghi-Asl, M. %D 2017 %\ 07/23/2017 %V 49 %N 2 %P 295-304 %! Laboratory Investigation of Non-Darcy Flow through Rounded Porous Materials %K Non-Darcy flow %K Coarse material %K Permeameter device %K hydraulic gradient %K Constant head test %R 10.22060/ceej.2015.407 %X 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.‎ %U https://ceej.aut.ac.ir/article_407_b26ff5349ceb0856bae9d86a1c2d3c9b.pdf