Hare, CL, Zafar, U, Ghadiri, M et al. (3 more authors) (2015) Analysis of the dynamics of the FT4 powder rheometer. Powder Technology, 285. 123 - 127. ISSN 0032-5910
Abstract
Traditional powder flow measurement devices, such as shear cells, operate in the quasi-static regime of shear strain rate. The FT4 powder rheometer of Freeman Technology, developed over the last two decades, has provided a clearer differentiation of powder flowability in some instances. This has been attributed to the instrument operating in the dynamic regime of shear strain rates, a feature that has yet to be established. We report an analysis of the dynamic behaviour of a bed of glass beads made cohesive by silanisation and subjected to standard FT4 testing procedure, where a rotating blade is driven into a cylindrical bed, using a combination of experimental measurements and numerical simulations by the Distinct Element Method. The DEM analysis underestimates the flow energy measured experimentally, although the agreement is improved when sliding friction is increased. The shear stress of the powder in front of the blade is shown to be roughly constant along the radial direction and increasing as the impeller penetrates the bed, suggesting a characteristic shear stress can be determined for a powder under a given test conditions in the FT4. For ease of simulations large beads were used (1.7 – 2.1 mm). Future work will investigate the influence of particle properties and operational conditions on the prevailing stresses and strain rates.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015, The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | flowability; dynamic flow; powder technology; DEM; shear stress |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Institute for Particle Science and Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Apr 2015 09:46 |
Last Modified: | 24 Oct 2015 07:38 |
Published Version: | http://dx.doi.org/10.1016/j.powtec.2015.04.039 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.powtec.2015.04.039 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:85230 |
Commentary/Response Threads
- Hare, CL, Zafar, U, Ghadiri, M, Freeman, T, Clayton, J and Murtagh, M Analysis of the dynamics of the FT4 powder rheometer. (deposited 21 Apr 2015 09:46) [Currently Displayed]