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Lookup NU author(s): Dr Sadegh NadimiORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Powder processing and manufacturing operations are rate processes for which the bottleneck is cohesive powder flow. Diversity of material properties and sensitivity to environmental conditions, such as humidity and tribo-electric charging, make its prediction very challenging, but highly desirable particularly when addressing a powder material for which only a small quantity is available. Furthermore, in a number of applications powder flow testing at low stress levels is highly desirable. Characterisation of bulk failure for flow initiation (quasi-static) of such powders is well established. However, bulk flow parameters are all sensitive to the speed with which the powder is sheared, but in contrast to quasi-static test methods, there is no shear cell for characterisation of bulk flow parameters in the dynamic regime. There are only a handful of instruments available for powder rheometry, in which the bulk resistance to motion can be quantified as a function of shear strain rate, but the challenge is relating the behaviour to the physical and mechanical properties of the constitutive particles. A critique of the current state of the art in rheometry of cohesive powder flow is presented, reviewing features of a number of widely used instruments.
Author(s): Ghadiri M, Matsusaka S, Pasha M, Nan W, Hare C, Vivacqua V, Zafar U, Nezamabadi S, Lopez A, Pasha M, Nadimi S
Publication type: Article
Publication status: Published
Journal: The Micromeritics
Print publication date: 15/01/2020
Online publication date: 15/12/2019
Acceptance date: 15/12/2019
Date deposited: 02/01/2020
ISSN (print): 0429-9051
ISSN (electronic): 2432-2075
Publisher: Hosokawa Micron Corporation
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