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Rheological response of granular materials under dynamic conditions

Lookup NU author(s): Dr Marv KhalaORCiD, Dr Colin HareORCiD

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).

Abstract

© 2021 Elsevier B.V. The rheological behaviour of a dense granular bed under dynamic conditions is investigated by simulating granular flow in the FT4 powder rheometer using the Discrete Element Method. The distribution of the prevailing stresses and strain rates in the granular bed, and their dependence on material properties and blade operational conditions, are analysed. The shear stress was found to be approximately constant in the radial direction along the blade but dissipates in the circumferential direction away from the blade. Analogously, the strain rate decreases with increasing angular distance away from the blade as the bed becomes less dynamic. An increase in the blade tip speed, particle aspect ratio and interfacial energy results in an increase in the average shear stress in the granular bed. A predictive model is proposed to compute the average shear stress in the granular bed based on the blade torque by considering the effects of blade tip speed, particle aspect ratio and interfacial energy.

Publication metadata

Author(s): Khala MJ, Hare C, Wu C-Y, Venugopal N, Murtagh MJ, Freeman T

Publication type: Article

Publication status: Published

Journal: Powder Technology

Year: 2022

Volume: 398

Print publication date: 01/01/2022

Online publication date: 16/12/2021

Acceptance date: 13/12/2021

Date deposited: 02/03/2022

ISSN (print): 0032-5910

ISSN (electronic): 1873-328X

Publisher: Elsevier BV

URL: https://doi.org/10.1016/j.powtec.2021.117074

DOI: 10.1016/j.powtec.2021.117074

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