Rheological Behavior of Dense Assemblies of Granular Materials

Sundaresan, Sankaran ; Tardos, Gabriel I ; Subramaniam, Shankar

Princeton University. Trustees.

关键词: Particle Properties;    Simulation;    Kinetics;    Granular Materials;    72 Physics Of Elementary Particles And Fields;   

DOI  :  10.2172/1026503
RP-ID  :  FG26-07NT43070
RP-ID  :  1026503

美国|英语

来源: UNT Digital Library

【 摘 要 】

Assemblies of granular materials behave differently when they are owing rapidly, from when they are slowly deforming. The behavior of rapidly owing granular materials, where the particle-particle interactions occur largely through binary collisions, is commonly related to the properties of the constituent particles through the kinetic theory of granular materials. The same cannot be said for slowly moving or static assemblies of granular materials, where enduring contacts between particles are prevalent. For instance, a continuum description of the yield characteristics of dense assemblies of particles in the quasistatic ow regime cannot be written explicitly on the basis of particle properties, even for cohesionless particles. Continuum models for this regime have been proposed and applied, but these models typically assume that the assembly is at incipient yield and they are expressed in terms of the yield function, which we do not yet know how to express in terms of particle-level properties. The description of the continuum rheology in the intermediate regime is even less understood. Yet, many practically important flows in nature and in a wide range of technological applications occur in the dense flow regime and at the transition between dilute and dense regimes; the lack of validated continuum rheological models for particle assemblies in these regimes limits predictive modeling of such flows. This research project is aimed at developing such rheological models.