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Flooding in a Vertically Rising Gas–Liquid Foam

Wang, Xinting; Evans, Geoffrey M.; Stevenson, Paul


Xinting Wang

Geoffrey M. Evans

Paul Stevenson


The maximum liquid fraction that stable pneumatic foam can support is studied in this paper in order to illuminate change of flow regime from turbulent foam flow to the “emulsion regime” in which the distinct interface between the foam layer and the bubbly liquid is lost; this regime transition is nominated as “flooding”. With further increases in gas flow rate, large (or “gross”) bubbles can appear and rise in the column, the existence of which depends on the absolute pressure at the column bottom. Experiments are carried out using foam stabilized by sodium dodecyl sulfate, and the liquid fraction of both the foam layer and the bubbly liquid are measured using a pressure gradient method. The maximum liquid fraction is found to be at a critical point when the interface between the foam and the bubbly liquid layer disappears. The predicted maximum liquid fraction in the foam is given by ε* = (n – 1)/(n + 1), where n is an adjustable constant that depends upon the characteristics of the gas–liquid interface, and the predictions have been experimentally verified.

Journal Article Type Article
Publication Date Apr 9, 2014
Journal Industrial & Engineering Chemistry Research
Print ISSN 0888-5885
Electronic ISSN 1520-5045
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 53
Issue 14
Pages 6150-6156
APA6 Citation Wang, X., Evans, G. M., & Stevenson, P. (2014). Flooding in a Vertically Rising Gas–Liquid Foam. Industrial & engineering chemistry research, 53(14), 6150-6156.
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