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Sliding on wet sand
, Article Granular Matter ; Volume 22, Issue 3 , May , 2020 ; Aliasgari, M ; Maleki Jirsaraei, N ; Rouhani, S ; Bonn, D ; Sharif University of Technology
Springer
2020
Abstract
We present sliding experiments of a sledge on wetted sand and describe that the frictional response is controlled by the penetration hardness of the granular medium. Adding a small amount of water to sand increases the hardness which results in a decrease of the sliding friction. Pouring even more water to sand results in a decrease of the hardness and a subsequent increase of the friction. This inverse correlation between hardness of a wetted granular material and its frictional response to sliding is found to be due to ploughing of the sledge. When the load of the sledge exceeds the penetration hardness of the water-sand mixture the granular material is irreversibly deformed, which is...
Development of a saturation-based μ(I)-rheology for wet granular materials using discrete element method
, Article Scientia Iranica ; Volume 28, Issue 5 B , 2021 , Pages 2719-2732 ; 10263098 (ISSN) ; Taghizadeh Manzari, M ; Hajilouy Benisi, A ; Sharif University of Technology
Sharif University of Technology
2021
Abstract
The present study employs Discrete Element Method (DEM) to establish a rheological model that relates the apparent viscosity of a granular material to shear rate, normal stress, and water saturation. In addition, a theoretical model was developed to determine water distribution and water-induced forces between particles for different saturations. The resulting forces were embedded in a 3D shear cell as a numerical rheometer, and a wet specimen was sheared between two walls. A power law rheological model was then obtained as a function of inertia number and saturation. It was found that up to a critical saturation, the apparent viscosity increased with saturation that was higher than that of...