Investigation of powder flowability at low stresses by DEM modelling

Stavrou, Alexandros Georgios, Hare, Colin, Hassanpour, Ali and Wu, Chuan-Yu (2020) Investigation of powder flowability at low stresses by DEM modelling Chemical Engineering Science, 211, 115307.

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Abstract

Ball indentation is a technique capable of assessing powder flowability down to very low consolidation stresses (≤1 kPa). With this method, powder flowability is determined by measuring the hardness of a powder bed, which allows the unconfined yield strength to be inferred via the constraint factor. The latter is well established for continuum materials, whereas for particulate systems its dependency on stress level and powder properties is not well defined. This work investigates these factors by simulating the ball indentation method using DEM. The constraint factor is shown to be independent of pre-consolidation stress. Constraint factor generally increases with interface energy for relatively cohesion-less powders, though not for cohesive powders. An increase in plastic yield stress leads to a decrease in the constraint factor. Increasing the coefficient of interparticle static friction reduces the constraint factor, while increasing the coefficient of inter-particle rolling friction significantly increases the constraint factor.

Item Type:	Article
Divisions :	Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :	Name Email ORCID Stavrou, Alexandros Georgios a.stavrou@surrey.ac.uk Hare, Colin c.hare@surrey.ac.uk Hassanpour, Ali Wu, Chuan-Yu
Date :	16 January 2020
DOI :	10.1016/j.ces.2019.115307
Copyright Disclaimer :	Copyright 2019 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords :	Powder flowability; Low consolidation stresses; Ball indentation; Shear cell; DEM modelling
Additional Information :	The financial support of the International Fine Particle Research Institute (IFPRI) is gratefully acknowledged. Furthermore, the authors greatly appreciate the MATLAB code provided by Dr. Massih Pasha (The Chemours Company) for the calculation of the input parameters for the DEM contact model used in this work.
Depositing User :	Diane Maxfield
Date Deposited :	08 Jan 2020 16:13
Last Modified :	22 Oct 2020 02:08
URI:	http://epubs.surrey.ac.uk/id/eprint/853300

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