Cavern Formation in Non-Newtonian Media in a Vessel Agitated by Submerged Recirculating Liquid Jets

Kennedy, S, Bhattacharyya, P, Eshtiaghi, N and Parthasarathy, R 2016, 'Cavern Formation in Non-Newtonian Media in a Vessel Agitated by Submerged Recirculating Liquid Jets', Industrial and Engineering Chemistry Research, vol. 55, no. 40, pp. 10771-10781.


Document type: Journal Article
Collection: Journal Articles

Title Cavern Formation in Non-Newtonian Media in a Vessel Agitated by Submerged Recirculating Liquid Jets
Author(s) Kennedy, S
Bhattacharyya, P
Eshtiaghi, N
Parthasarathy, R
Year 2016
Journal name Industrial and Engineering Chemistry Research
Volume number 55
Issue number 40
Start page 10771
End page 10781
Total pages 11
Publisher American Chemical Society
Abstract Cavern formation is a widely reported phenomenon in agitated vessels processing liquids with a yield stress. This study employs electrical resistance tomography and flow visualization techniques to monitor the spread of a tracer in a vessel containing complex non-Newtonian media agitated using submerged recirculating liquid jets. The experimental media are aqueous solutions of xanthan gum with varying concentrations. It has been demonstrated that when agitated using submerged jet, the tracer is localized within a fixed volume of the vessel and does not spread with time in the more concentrated xanthan gum solution, a phenomenon that is analogous to a cavern structure found in mechanical mixing. A Herschel-Bulkely model with a positive yield stress can be fitted to part of the rheogram of the more concentrated xanthan gum solution. The less-concentrated solution cannot be fitted with a positive yield stress model, and when agitated in a vessel, the tracer front pervades the entire volume of the vessel and no cavern is seen, in experiments when all other conditions are kept equal.
Subject Chemical Engineering not elsewhere classified
DOI - identifier 10.1021/acs.iecr.6b02578
Copyright notice © 2016 American Chemical Society.
ISSN 0888-5885
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