Non-invasive particle-scale investigation of the effects of blade speed and particle properties on mixture homogeneity evolution using X-ray CT
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2023-04-20
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Elsevier Ltd.
Abstract
A binary system of particles was mixed in a vertically bladed mixer and mixture homogeneity was reported using X-ray computed tomography (CT) and a particle-scale mixing index. The effects of particle density, size, and volume fraction, as well as mixer blade speed on mixture homogeneity evolution were investigated. For same sized particles, mixture homogeneity was found to deteriorate with increasing difference in particle densities. However, this could be countered by controlling for percolation, e.g., mixing heavier particles of larger size with smaller/lighter particles to improve mixing. Increasing blade speeds from 10 rpm to 30 rpm, deteriorated mixing, however, further increases from 30 rpm to 60 rpm resulted in improvements, indicating possible flow regime changes at different rotational speeds. Increases in the volume fraction of large/light particles increased the penetration of these particles to the bottom layers due to overall flow changes, which in turn appeared to improve mixing.
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This is a manuscript of an article published as Nadeem, Humair, Prajjwal Jamdagni, Shankar Subramaniam, Nandkishore K. Nere, and Theodore J. Heindel. "Non-invasive particle-scale investigation of the effects of blade speed and particle properties on mixture homogeneity evolution using X-ray CT." Chemical Engineering Science (2023): 118766.
DOI: 10.1016/j.ces.2023.118766.
Copyright 2023 Elsevier Ltd.
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