Multiscale rheophysics of nearly jammed granular flows in a high shear system
Artikel i vetenskaplig tidskrift, 2017

We investigate non-local features of granular flows in nearly jammed configurations. We identify the presence of contact networks and crystallization as the reasons for such a behavior and perform Discrete Element Simulations on a high shear disk impeller granulator. The association of particle properties (e.g. the coefficients of restitution and friction) with the observed flow structures is studied using multivariate data analysis and multilinear optimization. The effect of polydispersity on the structure of the contact networks is studied. A singularity in the momentum flux is observed when approaching a monosized particle assembly, implying the onset of crystallization. Macroscopic quantities, such as the velocity profiles and momentum flux, are linked to microscopic data from DEM simulations through several statistical methods: the spectral analysis (giving dominant frequencies of the flow), coordination numbers that map the local flow regimes and the pair correlation function that is weakly associated with the variations of the flow structure. (C) 2017 Elsevier B.V. All rights reserved.

High shear granulation

Dense granular flow

Multiscale

DEM

Författare

Mohammad Khalilitehrani

Kemi och kemiteknik, Kemiteknik, Kemisk miljövetenskap

Srdjan Sasic

Chalmers, Tillämpad mekanik, Strömningslära

Anders Rasmuson

Kemi och kemiteknik, Kemiteknik, Kemisk miljövetenskap

Powder Technology

0032-5910 (ISSN)

Vol. 315 356-366

Ämneskategorier

Kemiska processer

Kemiteknik

Strömningsmekanik och akustik

DOI

10.1016/j.powtec.2017.03.055