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|Title: ||Experimental study of void fraction behaviour in vertical bubbly gas-liquid flow using conductivity and measurements|
|Authors: ||Al-Oufi, Fahd M.|
Rielly, Chris D.
Cumming, Iain W.
|Issue Date: ||2007|
|Publisher: ||© The Administration of Saudi Clubs and Schools in the UK and Ireland, Term 26th|
|Citation: ||AL-OUFI, F.M., RIELLY, C.D. and CUMMING, I.W., 2007. Experimental study of void fraction behaviour in vertical bubbly gas-liquid flow using conductivity and measurements. IN: Al-Yami, A.M. (ed.). Proceedings of the Saudi Innovation Conference, Newcastle-upon-Tyne, United Kingdom, 11th- 12th May, pp. 178-186.|
|Abstract: ||The void fraction is an important variable in describing gas-liquid two-phase flows,
since it is required to predict the heat and mass transfer coefficients and the pressure
drop and is an indicator of the flow regime. The contrast in conductivity between
water and air is one way to measure the void fraction in gas-liquid flow. This project
has examined use of the ring conductivity electrodes to measuring the void fraction in
an up-flow bubble column. The conductivity method has potential to be a low cost,
safe and accurate method of measuring local void fractions in pipes and other process
engineering mass transfer devices. In this project, the void fraction was measured in an
air-water system by using conductivity in a 2" pipe equipped with two ring electrodes.
Further gas hold-up experiments were conducted in the annular channel formed
between 2" and a 4" pipe, using a system of four pairs of electrodes. The data obtained
from the experiments agreed fairly well with the Maxwell and Burggeman theories
which relate the dimensionless conductance to the void fraction. The measured void
fractions were correlated using the drift-flux model, as proposed by Zuber and
Findlay. Significant differences were observed between the void fraction
measurements obtained for the annular channel and for an empty pipe, when operated
at the same gas superficial velocity.|
|Description: ||This is a conference paper.|
|Version: ||Accepted for publication|
|Publisher Link: ||http://saudistudents.tripod.com/|
|Appears in Collections:||Conference Papers and Presentations (Chemical Engineering)|
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