Abstract
Annular flow is a common flow pattern of gas-liquid flow, which often occurs in many industrial applications. Based on the planar laser-induced fluorescence (PLIF) method and the digital image processing, the thickness of the liquid film in the vertical upward annular flow is obtained. The effect of the gas and liquid superficial velocity on the liquid film thickness and wave structure in annular flow is studied by the wavelet multi-resolution analysis. The variations of waves at different frequencies with the gas and liquid superficial velocity is discussed.
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