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Distortion correction and characteristics measurement of circumferential liquid film based on PLIF
Author(s) -
Xue Ting,
Li Chenyang,
Wu Bin
Publication year - 2019
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16612
Subject(s) - distortion (music) , planar laser induced fluorescence , materials science , reynolds number , measure (data warehouse) , optics , planar , refractive index , mechanics , laser , laser induced fluorescence , physics , computer science , amplifier , optoelectronics , turbulence , computer graphics (images) , cmos , database
Abstract For its advantages of noninvasion and high temporal–spatial resolution, planar laser‐induced fluorescence (PLIF) is increasingly applied to measure the liquid film near axial flow. However, the circumferential distribution characteristics of liquid film, which are significant for heat and mass transfer process, cannot be measured briefly by the axial imaging. Because of the refractive index difference of the gas and liquid as well as the circular pipe, circumferential observation suffers distortion inevitably. In this paper, PLIF is developed to measure the circumferential film with a virtual dual‐view vision sensor, besides, the distortion model is established and a new distortion correction method is proposed. The effective view of circumferential liquid film is extended to 260°. Characteristics of vertical falling film are measured under different Reynolds numbers. Compared with the classical prediction models, the experimental results show the proposed method is capable for measuring circumferential film and the distribution characteristics conveniently and reliably.