Correlation between powder flow properties measured by shear testing and Hausner ratio

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dc.citation.volume102
dc.contributor.authorSaw HY
dc.contributor.authorDavies CE
dc.contributor.authorPaterson AHJ
dc.contributor.authorJones J
dc.date.available2015
dc.date.issued2015
dc.description.abstractShear testing provides rigorous estimates of flow properties relevant to the characterization, handling, and processing of powders, and is a necessary test procedure in the formal design of powder storage facilities. However, despite the automation of modern test equipment, it can be time consuming and expensive. In contrast, measurement of bulk density is straightforward and less laborious, and tapping devices are cheaper. Here we explore the relationship between Hausner ratio and cohesion and also examine correlation between Hausner ratio, σc/σy, and σpre for a suite of 13 milled and 2 spray-dried lactose powders, 3 sand samples and 3 samples of refractory dust; Hausner ratio is the ratio of tapped bulk density to loose bulk density, σc is major consolidation stress, σy is unconfined yield stress and σpre is preconsolidation stress. Cohesion and flow function were measured with an annular shear cell at values of σpre up to 5 kPa. Loose poured bulk density was measured following a modified New Zealand standard and tapped density measurement was based on a method for dry dairy products and the European Pharmacopoeia; Hausner ratio at 1250 taps was used. Our results show that cohesion at σpre of 0.31 kPa, 0.61 kPa, 1.20 kPa, 2.41 kPa, and 4.85 kPa correlates linearly with Hausner ratio; the slope and intercept of the correlation are functions of σpre. A plot of σc/σy against Hausner ratio shows an exponential decay trend and regression yields two fitting parameters that correlate well with σpre. These correlations are potentially useful for assessing flow characteristics when shear testing cannot be performed.
dc.description.confidentialfalse
dc.description.publication-statusPublished
dc.format.extent218 - 225 (8)
dc.identifierhttp://www.sciencedirect.com/science/article/pii/S1877705815001332
dc.identifier.citationProcedia Engineering, 2015, 102 pp. 218 - 225 (8)
dc.identifier.doi10.1016/j.proeng.2015.01.132
dc.identifier.elements-id242953
dc.identifier.harvestedMassey_Dark
dc.identifier.issn1877-7058
dc.publisherElsevier
dc.publisher.urihttp://www.sciencedirect.com/science/article/pii/S1877705815001332
dc.relation.isPartOfProcedia Engineering
dc.rightsUnder a Creative Commons license
dc.subjectbulk density
dc.subjectcohesion
dc.subjectHausner ratio
dc.subjectpowder flow function
dc.subjecttapped density
dc.subject.anzsrc09 Engineering
dc.titleCorrelation between powder flow properties measured by shear testing and Hausner ratio
dc.typeJournal article
pubs.notesNot known
pubs.organisational-group/Massey University
pubs.organisational-group/Massey University/College of Sciences
pubs.organisational-group/Massey University/College of Sciences/School of Food and Advanced Technology
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