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Imaging water velocity and volume fraction distributions in water continuous multiphase flows using inductive flow tomography and electrical resistance tomography

Meng, Yiqing and Lucas, Gary P. (2017) Imaging water velocity and volume fraction distributions in water continuous multiphase flows using inductive flow tomography and electrical resistance tomography. Measurement Science and Technology, 28 (5). ISSN 0957-0233

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Abstract

This paper presents the design and implementation of an inductive flow tomography (IFT)
system, employing a multi-electrode electromagnetic flow meter (EMFM) and novel
reconstruction techniques, for measuring the local water velocity distribution in water
continuous single and multiphase flows. A series of experiments were carried out in
vertical-upward and upward-inclined single phase water flows and ‘water continuous’
gas–water and oil–gas–water flows in which the velocity profiles ranged from axisymmetric
(single phase and vertical-upward multiphase flows) to highly asymmetric (upward-inclined
multiphase flows). Using potential difference measurements obtained from the electrode
array of the EMFM, local axial velocity distributions of the continuous water phase were
reconstructed using two different IFT reconstruction algorithms denoted RT#1, which
assumes that the overall water velocity profile comprises the sum of a series of polynomial
velocity components, and RT#2, which is similar to RT#1 but which assumes that the
zero’th order velocity component may be replaced by an axisymmetric ‘power law’ velocity
distribution. During each experiment, measurement of the local water volume fraction
distribution was also made using the well-established technique of electrical resistance
tomography (ERT). By integrating the product of the local axial water velocity and the local
water volume fraction in the cross section an estimate of the water volumetric flow rate was
made which was compared with a reference measurement of the water volumetric flow rate.
In vertical upward flows RT#2 was found to give rise to water velocity profiles which
are consistent with the previous literature although the profiles obtained in the multiphase
flows had relatively higher central velocity peaks than was observed for the single phase
profiles. This observation was almost certainly a result of the transfer of axial momentum
from the less dense dispersed phases to the water, which occurred preferentially at the pipe
centre. For upward inclined multiphase flows RT#1 was found to give rise to water velocity
profiles which are more consistent with results in the previous literature than was the case
for RT#2—which leads to the tentative conclusion that the upward inclined multiphase
flows investigated in the present study did not contain significant axisymmetric velocity
components.

Item Type: Article
Subjects: Q Science > QC Physics
T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Schools: School of Computing and Engineering
Related URLs:
Depositing User: Yiqing Meng
Date Deposited: 30 Jun 2017 14:14
Last Modified: 30 Jun 2017 18:39
URI: http://eprints.hud.ac.uk/id/eprint/32130

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