Microstructure evolution in density relaxation by tapping

Abstract

The density relaxation phenomenon is modeled using both Monte Carlo and discrete element simulations to investigate the effects of regular taps applied to a vessel having a planar floor filled with monodisperse spheres. Results suggest the existence of a critical tap intensity which produces a maximum bulk solids fraction. We find that the mechanism responsible for the relaxation phenomenon is an evolving ordered packing structure propagating upwards from the plane floor.

Steady state of tapped granular polygons

“…In recent years, the dependency of the steady state packing fraction, φ, on the tapping intensity, Γ, has been shown to be nonmonotonic; presenting a minimum at relatively high values of Γ for disks and spheres [2,3], and a maximum at very low Γ for spheres [4]. In general, the symbol Γ is used for the reduced peak acceleration given to the system during a tap.…”

Micro-macro and jamming transition of polydisperse granular materials

“…over-compression or tapping/driving (data not shown). Both (isotropic) modes of deformation lead to more compact, better packed configurations [21,167,220]. Considering different system sizes, and different preparation procedures, we confirmed that the jamming regime is the same (within fluctuations) for all the cases considered, see Appendix Fig.…”

“…Over-compressing a soft granular assembly is analogous to tapping [167,220] more rigid ones, in so far that both methods lead to more compact packing structures, i.e., both represent isotropic perturbations. These changes are shown in Fig.…”

Integrability analysis of regular and fractional Blackmore-Samulyak-Rosato fields

“…This also appears to be the case for higher space dimensions, and we intend to address this in a forthcoming paper, where we shall present a detailed investigation of solitons and other wave-like phenomena. These results will be compared with the experimental findings on various granular flow regimes such as the types in Rosato et al [22,23] in accordance with our continuing project on the development of dynamical systems based methods for predicting particulate dynamics (cf. [6]).…”

“…[6,17,23,[23][24][25]). It took the form of the following integro-partial differential equation (IPDE):…”