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Rheometry of Cohesive Powder Flow

Lookup NU author(s): Dr Sadegh Nadimi

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Abstract

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.


Publication metadata

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

Year: 2020

Volume: 63

Pages: 3-12

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

URL: https://doi.org/10.24611/micromeritics.2020005

DOI: 10.24611/micromeritics.2020005


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