Al-Oufi_et_al_Journal paper _2_.pdf (279.12 kB)
Destabilisation of a homogeneous bubbly flow in an annular gap bubble column
journal contribution
posted on 2010-11-24, 17:16 authored by Fahd M. Al-Oufi, Iain W. Cumming, Chris RiellyChris RiellyExperimental 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.
Funding
Void fraction profiles, heterogeneous flow, flow transition, two-point conductivity probe
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- 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.Publisher
Wiley (© Canadian Society for Chemical Engineering)Version
- AM (Accepted Manuscript)
Publication date
2010Notes
This is a pre-publication version of an article published in The Canadian Journal of Chemical Engineering.ISSN
1939-019XPublisher version
Language
- en