The influence of injection velocity and relaxation time on the spreading of tracers in viscoelastic liquids agitated by submerged, recirculating jets with low Reynolds numbers

Bhattacharyya, P, Kennedy, S, Xu, Q, Eshtiaghi, N and Parthasarathy, R 2017, 'The influence of injection velocity and relaxation time on the spreading of tracers in viscoelastic liquids agitated by submerged, recirculating jets with low Reynolds numbers', AIChE Journal, vol. 63, pp. 3132-3140.


Document type: Journal Article
Collection: Journal Articles

Title The influence of injection velocity and relaxation time on the spreading of tracers in viscoelastic liquids agitated by submerged, recirculating jets with low Reynolds numbers
Author(s) Bhattacharyya, P
Kennedy, S
Xu, Q
Eshtiaghi, N
Parthasarathy, R
Year 2017
Journal name AIChE Journal
Volume number 63
Start page 3132
End page 3140
Total pages 9
Publisher John Wiley and Sons
Abstract We provide experimental demonstration that the spread of tracer elements in a tank containing a viscoelastic liquid and agitated by a submerged jet pointing to the base of the tank can be influenced by the relaxation time of the liquid. We analyzed the temporal spreading of the boundary of a tracer-front in two dimensions using flow visualization at early stages and found that for a given fluid, the evolution of the tracer-front at various injection velocities follows a universal trajectory when considered on a normalized time scale of math formula, where t is observation time, math formula is injection velocity and math formula is the effective diffusivity of the tracer elements in the medium. For a different fluid, at a given math formula, the trajectory scales with the relaxation time of the fluid. The importance of relaxation time to the evolution of a tracer-front is something previously unreported.
Subject Wastewater Treatment Processes
Rheology
Keyword(s) non-Newtonian flow
viscoelasticity
relaxation time
agitated vessels
flow visualization
DOI - identifier 10.1002/aic.15640
Copyright notice © 2017 American Institute of Chemical Engineers
ISSN 1547-5905
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