An experimental characterization of downwards gas-liquid annular flow by laser-induced fluorescence: Flow regimes and film statistics

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• 作者：Ivan Zadrazil ; Omar K. Matar ; Christos N. Markides
• 关键词：Annular flow ; Entrainment ; Laser-induced fluorescence ; Flow regimes ; Film statistics
• 刊名：International Journal of Multiphase Flow
• 出版年：April, 2014
• 年：2014
• 卷：60
• 期：Complete
• 页码：87-102
• 全文大小：4580 K

文摘

Downwards co-current gas-liquid annular flows were studied experimentally and characterized. An advanced optical laser-based measurement technique, namely Planar Laser-Induced Fluorescence (PLIF), was used for the visualization of the annular flow over a range of liquid Reynolds numbers and gas Reynolds numbers . Four distinct flow regimes, namely the 鈥榙ual-wave鈥? 鈥榯hick ripple鈥? 鈥榙isturbance wave鈥?and 鈥榬egular wave鈥?regimes, have been identified based on qualitative information and a consequent quantitative analysis that provided information on the film thickness, interface and wave statistics, and gas entrainment into the liquid film. The mean film thickness data are generally in good agreement with previous studies. Evidence suggests that the turbulent gas phase affects strongly the shape of the interface, and that the mechanism for gas entrainment into the liquid film is strongly reliant on the existence of large-amplitude waves.