Destabilisation of a homogeneous bubbly flow in an annular gap bubble colum

Chris Rielly (1254369)

Fahd M. Al-Oufi (7128074)

Iain W. Cumming (2421535)

The Canadian Journal of Chemical Engineering

English

Loughborough University Institutional Repository

Destabilisation of a homogeneous bubbly flow in an annular gap bubble column

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

https://repository.lboro.ac.uk/articles/Destabilisation_of_a_homogeneous_bubbly_flow_in_an_annular_gap_bubble_column/9246839/files/16830707.pdf

Destabilisation of a homogeneous bubbly flow in an annular gap bubble column

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Loughborough University Institutional Repository

Loughborough University Institutional Repository