Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 27, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/27/6/065204
Keywords
interfacial film thickness; gas-liquid displacement; laser probing; two-phase flow measurement
Funding
- Research Grants Council (RGC) of the Hong Kong Special Administration Region, China [618210, 617812]
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Measurement of liquid film thickness in gas-liquid plug/slug flows is a challenging task. A novel laser interference method for measuring the interfacial film thickness of gas-liquid displacement in a plug flow has been developed. This novel technique utilizes light scattering from different liquid/gas interfaces in forming interference fringes. The interference fringes are used for calculating the film thickness. A set of simultaneous equations is derived based on geometrical optics. The experiment set up is not complex and is easy to install. The fringes are recorded by a charge-coupled device high speed camera and the image data are calculated using fast Fourier transform (FFT) and a non-linear least squares Levenberg-Marquardt algorithm. The uncertainty of this measurement technique is quite small (0.3 mu m) and the entire film thickness profile can be measured at the same time.
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