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|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|
|Publisher Link: ||http://www.saudiinternationalconference.org/|
|Appears in Collections:||Closed Access (Chemical Engineering)|
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