An ERT system for research on dynamic foams

Xie, W., Randall, E. W., Neethling, N. J. and Cilliers, J. J. (2012). An ERT system for research on dynamic foams. In: 6th International Symposium on Process Tomography. 6th International Symposium on Process Tomography ISPT6, Cape Town, South Africa, (1-8). 26 - 28 March 2012.

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Name Description MIMEType Size Downloads
Author Xie, W.
Randall, E. W.
Neethling, N. J.
Cilliers, J. J.
Title of paper An ERT system for research on dynamic foams
Conference name 6th International Symposium on Process Tomography ISPT6
Conference location Cape Town, South Africa
Conference dates 26 - 28 March 2012
Proceedings title 6th International Symposium on Process Tomography
Publication Year 2012
Sub-type Fully published paper
ISBN 9780620530392
Start page 1
End page 8
Total pages 8
Collection year 2013
Language eng
Formatted Abstract/Summary
Foams, which are a type of dispersed system, can be easily found in industrial processes. Research
has been carried out on foams for more than 100 years. Recently, research on measurement
techniques for dynamic foams has become a very active area. It is proposed to develop a
measurement method for the flowing foams in this research. The requirements for this measurement
technique should be rapid response, non-invasive, and low cost.

Electrical Resistance Tomography (ERT) is non-invasive and rapid response to meet the above
requirements. Systematic research has been performed to study dynamic foams using ERT technique.
An ERT system has been developed by researchers from University of Manchester (previously UMIST)
and University of Cape Town for this work. This system uses a switched bi-directional constant current
source to produce the electric field in the measuring vessel. The adjacent measuring sequence was
applied in this system, in which each set includes 104 independent measurements. A modified
Newton-Raphson (NR) method for ERT reconstruction algorithm has been applied. In addition, the
visual method that utilises a digital video camera (Panasonic NV-DS778) has been used as the test
method. In this paper, ERT images showed that the system could identify coarse foam regions (high
resistivity areas) and detect coalescence areas in the flowing foams. This is a useful technique for
obtaining internal information of the flowing foam column. Further application of this technique for
flotation froth will be carried out at JKMRC Centre, University of Queensland, Australia.
Keyword Electrical Resistance Tomography (ERD
Dynamic foams
Bi-directional constant current source
Modified Newton-Raphson (NR) method
Q-Index Code EX
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Institutional Status UQ

Document type: Conference Paper
Collections: Julius Kruttschnitt Mineral Research Centre Publications
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Created: Mon, 23 Jul 2012, 09:34:38 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre