Evolution of flow regimes in non-Newtonian liquids under gas sparging

Xu, Q, Bhattacharyya, P, Allitt, D, Eshtiaghi, N and Parthasarathy, R 2018, 'Evolution of flow regimes in non-Newtonian liquids under gas sparging', Chemical Engineering Science, vol. 176, pp. 153-156.


Document type: Journal Article
Collection: Journal Articles

Title Evolution of flow regimes in non-Newtonian liquids under gas sparging
Author(s) Xu, Q
Bhattacharyya, P
Allitt, D
Eshtiaghi, N
Parthasarathy, R
Year 2018
Journal name Chemical Engineering Science
Volume number 176
Start page 153
End page 156
Total pages 4
Publisher Elsevier
Abstract This paper provides experimental evidence supporting the idea that the transition to turbulent flow is governed by the ratio of the specific power input (SPI) and the term G/λ, where G is the viscoelastic modulus of the liquid and λ is the relaxation time, in a vessel containing a fluid agitated by sparged gas (air) at low superficial gas velocities. This finding provides a method for judging the flow regime within a vessel a priori using a nondimensional quantity and can be used as a scale for decision-making in cases where real-time visual analysis is not possible. While the work reported below is motivated by anaerobic digestion of wastewater sludge, the results are obtained using model liquids and should, therefore, have wide application in chemical process engineering, such as CFD simulation of mixing in viscoelastic fluids and mixing in fermentation processes.
Subject Chemical Engineering not elsewhere classified
Keyword(s) Flow regime
Flow visualisation
Gas sparging
Mixing
Rheology
Sludge
DOI - identifier 10.1016/j.ces.2017.10.034
Copyright notice © 2017 Elsevier Ltd
ISSN 0009-2509
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