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Title: Destabilisation of a homogeneous bubbly flow in an annular gap bubble column
Authors: Al-Oufi, Fahd M.
Cumming, Iain W.
Rielly, Chris D.
Keywords: Void fraction profiles
Heterogeneous flow
Flow transition
Two-point conductivity probe
Issue Date: 2010
Publisher: Wiley (© Canadian Society for Chemical Engineering)
Citation: AL-OUFI, F.M., CUMMING, I.W. and RIELLY, C.D., 2010. Destabilisation of a homogeneous bubbly flow in an annular gap bubble column. The Canadian Journal of Chemical Engineering, 88 (4), pp.482–490.
Abstract: Experimental results are presented to show that there are very significant differences in the mean gas void fractions measured in an open tube and a annular gap bubble column, when operated at the same gas superficial velocity, using a porous sparger. The mean gas void fraction decreases with increasing ratio of the inner to outer diameter of the annular gap column and the transition to heterogeneous flow occurs at lower gas superficial velocities and lower void fractions. Two reasons are proposed and validated by experimental investigations: (1) the presence of the inner tube causes large bubbles to form near the sparger, which destabilize the homogeneous bubbly flow and reduce the mean void fraction; this was confirmed by deliberately injecting large bubbles into a homogeneous dispersion of smaller bubbles and (2) the shape of the void fraction profiles changes with gap geometry and this affects the distribution parameter in the drift flux model.
Description: This is a pre-publication version of an article published in The Canadian Journal of Chemical Engineering.
Sponsor: Void fraction profiles, heterogeneous flow, flow transition, two-point conductivity probe
Version: Accepted for publication
DOI: 10.1002/cjce.20301
URI: https://dspace.lboro.ac.uk/2134/7343
Publisher Link: http://dx.doi.org/10.1002/cjce.20301
ISSN: 1939-019X
Appears in Collections:Published Articles (Chemical Engineering)

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