Development of a saturation-based μ(I)-rheology for wet granular materials using discrete element method

Ghorbani, R ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.24200/sci.2021.56993.5014
  3. Publisher: Sharif University of Technology , 2021
  4. Abstract:
  5. 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 the dry specimen. However, when the saturation exceeded the critical value, the viscosity suddenly dropped below that of the dry condition. To evaluate the model, the collapse of two-dimensional granular material on a horizontal rigid bed was studied using continuum-based numerical simulation which utilized the proposed rheological model. © 2021 Sharif University of Technology
  6. Keywords:
  7. Granular materials ; Viscosity ; Water supply systems ; Apparent viscosity ; Discrete elements method ; Inertia number ; Normal stress ; Rheological models ; Shear-rate ; Theoretical modeling ; Water saturations ; Water-water ; Wet granular materials ; Finite difference method ; Development level ; Discrete element method ; Granular medium ; Rheology ; Saturation
  8. Source: Scientia Iranica ; Volume 28, Issue 5 B , 2021 , Pages 2719-2732 ; 10263098 (ISSN)
  9. URL: http://scientiairanica.sharif.edu/article_22208.html