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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/8715

Title: Experimental study on bubbly flow transition in vertical annular gap bubble column
Authors: Al-Oufi, Fahd M.
Cumming, Iain W.
Rielly, Chris D.
Keywords: Homogeneous flow
Local void fraction
Void fraction profile
Double-sensor electrical probe
Issue Date: 2009
Publisher: University of Surrey
Citation: AL-OUFI, F.M., CUMMING, I.W. and RIELLY, C.D., 2009. Experimental study on bubbly flow transition in vertical annular gap bubble column. IN: Aloqbi, A., Alsini, I. and Alzimani, K. (eds.). Conference Proceedings, The Third Saudi International Conference, 5th-6th June 2009.
Abstract: Mean and local gas void fractions in vertical upward, two-phase flows contained within the annular gap between two concentric tubes are presented. For a given gas superficial velocity, jg, the mean void fraction, , was found to decrease as the diameter ratio of the two tubes approached unity (i.e. for narrower gaps). Moreover, was significantly lower than that obtained in an open tube at the same jg. Two explanations were proposed: (i) large bubbles, generated in the annular gap, destabilised the flow, and (ii) the driftflux distribution parameter in an open tube was different to that in an annular gap, which results in a different mean . It was shown that injection of large bubbles into a homogeneous flow led to an early transition. Furthermore, the void fraction profiles in the annular gaps depended on both jg and the gap geometry
Description: This conference paper is Closed access.
Version: Closed access
URI: https://dspace.lboro.ac.uk/2134/8715
Publisher Link: http://www.saudiinternationalconference.org/
ISBN: 9781844690206
Appears in Collections:Closed Access (Chemical Engineering)

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