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Partic. vol. 33 pp. 11-16 (August 2017)
doi: 10.1016/j.partic.2016.11.004

Void fraction measurement of bubble and slug flow in a small channel using the multivision technique

Huajun Li, Xiaohu Zheng, Haifeng Ji*, Zhiyao Huang, Baoliang Wang, Haiqing Li

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hfji@iipc.zju.edu.cn

Highlights

    • A new void fraction measurement method based on multivision technique was proposed. • The multivision system was developed to obtain images from two perpendicular directions. • A new void fraction measurement model was developed to determine the void fraction.

Abstract

Using the multivision technique, a new void fraction measurement method was developed for bubble and slug flow in a small channel. The multivision system was developed to obtain images of the two-phase flow in two perpendicular directions. The obtained images were processed—using image segmentation, image subtraction, Canny edge detection, binarization, and hole filling—to extract the phase boundaries and information about the bubble or slug parameters. With the extracted information, a new void fraction measurement model was developed and used to determine the void fraction of the two-phase flow. The proposed method was validated experimentally in horizontal and vertical channels with different inner diameters of 2.1, 2.9, and 4.0 mm. The proposed method of measuring the void fraction has better performance than the methods that use images acquired in only one direction, with a maximum absolute difference between the measured and reference values of less than 6%.

Graphical abstract

Keywords

Gas–liquid two-phase flow; Void fraction; Bubble flow; Slug flow; Multivision technique