ALOUFI et al - GLS10 (Manuscript v2 revised).pdf (586.8 kB)
Download fileAn experimental study of gas void fraction in dilute alcohol solutions in annular gap bubble columns using a four-point conductivity probe
journal contribution
posted on 2013-01-16, 15:19 authored by Fahd M. Al-Oufi, Chris RiellyChris Rielly, Iain W. CummingThe influence of alcohol concentration on the gas void fraction in open tube and
annular gap bubble columns has been investigated using a vertical column with an
internal diameter of 0.102 m, containing a range of concentric inner tubes which
formed an annular gap; the inner tubes had diameter ratios from 0.25 - 0.69. Gas
(air) superficial velocities in the range 0.014-0.200 m/s were investigated. Tap water
and aqueous solutions of ethanol and isopropanol, with concentrations in the range 8
- 300 ppm by mass, were used as the working liquids. Radial profiles of the local
void fraction were obtained using a four-point conductivity probe and were crosssectionally
averaged to give mean values that were within 12% of the volumeaveraged
gas void fractions obtained from changes in aerated level. The presence of
alcohol inhibited the coalescence between the bubbles and consequently increased
the mean gas void fraction at a given gas superficial velocity in both the open tube
and the annular gap bubble columns. This effect also extended the range of
homogeneous bubbly flow and delayed the transition to heterogeneous flow.
Moreover, isopropanol results gave slightly higher mean void fractions compared to
those for ethanol at the same mass fraction, due to their increased carbon chain
length. It was shown that the void fraction profiles in the annular gap bubble column
were far from uniform, leading to lower mean void fractions than were obtained in an
open tube for the same gas superficial velocity and liquid composition.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Citation
AL-OUFI, F.M., RIELLY, C.D. and CUMMING, I.W., 2011. An experimental study of gas void fraction in dilute alcohol solutions in annular gap bubble columns using a four-point conductivity probe. Chemical Engineering Science, 66 (23), pp.5739–5748.Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publication date
2011Notes
This is the author’s version of a work that was accepted for publication in the journal Chemical Engineering Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published at: http://dx.doi.org/10.1016/j.ces.2011.03.061ISSN
0009-2509Publisher version
Language
- en