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Sensors 2016, 16(2), 159; doi:10.3390/s16020159

A New Void Fraction Measurement Method for Gas-Liquid Two-Phase Flow in Small Channels

1
State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
2
Key Laboratory of Complex Systems Modeling and Simulation of Ministry of Education, Hangzhou Dianzi University, Hangzhou 310018, China
*
Author to whom correspondence should be addressed.
Academic Editor: Tindaro Ioppolo
Received: 6 December 2015 / Revised: 13 January 2016 / Accepted: 22 January 2016 / Published: 27 January 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3128 KB, uploaded 27 January 2016]   |  

Abstract

Based on a laser diode, a 12 × 6 photodiode array sensor, and machine learning techniques, a new void fraction measurement method for gas-liquid two-phase flow in small channels is proposed. To overcome the influence of flow pattern on the void fraction measurement, the flow pattern of the two-phase flow is firstly identified by Fisher Discriminant Analysis (FDA). Then, according to the identification result, a relevant void fraction measurement model which is developed by Support Vector Machine (SVM) is selected to implement the void fraction measurement. A void fraction measurement system for the two-phase flow is developed and experiments are carried out in four different small channels. Four typical flow patterns (including bubble flow, slug flow, stratified flow and annular flow) are investigated. The experimental results show that the development of the measurement system is successful. The proposed void fraction measurement method is effective and the void fraction measurement accuracy is satisfactory. Compared with the conventional laser measurement systems using standard laser sources, the developed measurement system has the advantages of low cost and simple structure. Compared with the conventional void fraction measurement methods, the proposed method overcomes the influence of flow pattern on the void fraction measurement. This work also provides a good example of using low-cost laser diode as a competent replacement of the expensive standard laser source and hence implementing the parameter measurement of gas-liquid two-phase flow. The research results can be a useful reference for other researchers’ works. View Full-Text
Keywords: gas-liquid two-phase flow; small channel; void fraction; flow pattern; photodiode array sensor; laser diode gas-liquid two-phase flow; small channel; void fraction; flow pattern; photodiode array sensor; laser diode
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, H.; Ji, H.; Huang, Z.; Wang, B.; Li, H.; Wu, G. A New Void Fraction Measurement Method for Gas-Liquid Two-Phase Flow in Small Channels. Sensors 2016, 16, 159.

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