Measuring powder flowability with a modified Warren Spring cohesion tester--颗粒学报PARTICUOLOGY

Mohammed, S. A., Abdullah, E. C., Geldart, D., & Raman, A. A. A. (2011). Measuring powder flowability with a modified Warren Spring cohesion tester. Particuology, 9(2), 148-154. https://doi.org/10.1016/j.partic.2010.10.004

Measuring powder flowability with a modified Warren Spring cohesion tester

Salam A. Mohammed ^a *, Ezzat C. Abdullah ^a, Derek Geldart ^b, Abdul Aziz A. Raman ^a

a Department of Chemical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
b Powder Research Ltd., Harrogate, & University of Leeds, UK

10.1016/j.partic.2010.10.004

Volume 9, Issue 2, April 2011, Pages 148-154

Received 1 April 2010, Revised 14 September 2010, Accepted 2 October 2010, Available online 17 February 2011.

E-mail: salam73@perdana.um.edu; sassuki_73@hotmail.com

Highlights

Abstract

The measurement of powder flowability is a major concern for most industrial processes that deal with the handling of bulk solids as raw materials, intermediates, or products. The development of devices that measure the flowability of non-aerated powders has not progressed as rapidly as might have been hoped since most research activities have been based on various types of shear testers intended to aid the design of hoppers. A new flowability indicator named as weighted cohesion (WS) is established using newly improved version of direct cohesion texture. A cornerstone of the proposed technique is that the procedure is automated, using a digital Warren Spring tester called Warren Spring-University of Malaya cohesion tester (WSUMCT), thus making results operator-insensitive. Besides being a practical tool to diagnose the cohesion of experimental powders, the ratio between measured cohesion (using WSUMCT) and aerated density (using Hosokawa PT-S) provides us with a powerful technique to research fundamental particle internal cohesion forces directly and use these data to indicate the flowability. In this work, a series of fine (9.4 μm) and coarse (60 μm) porous silica gel particle mixtures, and mixtures of fine (28 μm) and coarse (72 μm) glass ballotini as well, were used as test powders. The results from these tests agree well with relative flowability determined on our newly driven indicator using WSUMCT. The validation of aerated weighted cohesion (WSA) as a flowability indicator was authenticated by comparing the conducted parameter with established measured Hausner ratio (HR) and angle of repose (AoR).

Graphical abstract

Keywords

Flowability; Cohesion strength; Hausner ratio; Particle size; Angle of repose; Cohesive powder

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