Particle shear-rate history in a Taylor-Couette column

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Abstract

In previous investigations of shear-rate influence on aggregation processes in Taylor-Couette columns, average shear rates have been determined which were based on either laminar non-vortex flow solutions or numerical solutions of Taylor Vortex flow. Correlations between effectiveness of aggregation and shear rate are then made on the basis of this average shear rate. In this study we show that the use of this approach must be undertaken with caution. Particle tracking algorithms are coupled with a numerical solution of the fluid flow field to obtain shear histories for several particle densities. It is shown that an average fluid shear rate is not necessarily correlated to the average shear rate to which aggregating particles are subject as they traverse the Taylor-Couette column. It is observed that as the rotation rate (or the non-dimensional parameter known as the Taylor number) is increased beyond the maximum allowed for Couette flow, the percentage of neutrally buoyant particles exposed at some time during their history to large shear rates increases. This point is even more important when buoyant particles are considered.

Original languageEnglish
Title of host publicationLiquid-Solid Flows
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages23-30
Number of pages8
Volume189
ISBN (Print)0791813762
Publication statusPublished - 1 Jan 1994
Externally publishedYes
EventProceedings of the 1994 ASME Fluids Engineering Division Summer Meeting. Part 9 (of 18) - Lake Tahoe, United States of America
Duration: 19 Jun 199423 Jun 1994

Conference

ConferenceProceedings of the 1994 ASME Fluids Engineering Division Summer Meeting. Part 9 (of 18)
CountryUnited States of America
CityLake Tahoe
Period19/06/9423/06/94

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