title: A New Void Fraction Measurement Method for Gas-Liquid Two-Phase Flow in Small Channels.
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.
authors.affiliation: State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China. lihuajun@zju.edu.cn.
authors.forename: Huajun
authors.initials: H
authors.lastname: Li
authors.affiliation: State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China. hfji@iipc.zju.edu.cn.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Ji
authors.affiliation: State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China. zyhuang@iipc.zju.edu.cn.
authors.forename: Zhiyao
authors.initials: Z
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China. blwang@iipc.zju.edu.cn.
authors.forename: Baoliang
authors.initials: B
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China. hqli@iipc.zju.edu.cn.
authors.forename: Haiqing
authors.initials: H
authors.lastname: Li
authors.affiliation: Key Laboratory of Complex Systems Modeling and Simulation of Ministry of Education, Hangzhou Dianzi University, Hangzhou 310018, China. wugh@hdu.edu.cn.
authors.forename: Guohua
authors.initials: G
authors.lastname: Wu
keywords: flow pattern; gas-liquid two-phase flow; laser diode; photodiode array sensor; small channel; void fraction
references.citation: Rev Sci Instrum. 2008 Dec;79(12):125105
references.pmid: 19123590