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MEASUREMENT OF GAS-LIQUID TWO-PHASE FLOW IN MINI-CHANNELS USING laser FOCUS DISPLACEMENT METER

MEASUREMENT OF GAS-LIQUID TWO-PHASE FLOW IN MINI-CHANNELS US...

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多相流研究进展国际会议

作者： Tomoji Takamasa Tatsuya Hazuku Norihiro Fukamachi Takashi Hibiki Mamoru Ishii a Faculty of Marine Technology Tokyo University of Marine Science and Technology Tokyo Japan a Faculty of Marine Technology Tokyo University of Marine Science and Technology Tokyo Japan a Faculty of Marine Technology Tokyo University of Marine Science and Technology Tokyo Japan b Research Reactor Institute Kyoto University Osaka Japan c School of Nuclear Engineering Purdue University IN USA

＜正＞ This paper presents a new method for measuring the interfacial displacement of a liquid film in microchannels using a laser focus displacement meter （LFD）. The purpose of the study is to clarify the effectiveness of the new method for obtaining detailed information concerning interfacial displacement, especially in the case of a thin liquid film, in microand mini-channels. To prevent the tube wall signal from disturbing that of the gas-liquid interface, a fluorocarbon tube with water box was used;the refraction index of this device is the same as that for water. With this method, accurate instantaneous measurements of interfacial displacement of the liquid film were achieved. The error caused by refraction of the laser beam passing through the acrylic water box and fluorocarbon tube was estimated analytically and experimentally. The formulated analytical equation can estimate the real interface displacement using measured displacement in a fluorocarbon tube of 25 μm to 2.0 mm I.D. A preliminary test using fluorocarbon tubes of 1 and 2 mm I.D. showed that the corrected interface displacement calculated by the equation agreed with real displacement within a 1% margin of error. It was also confirmed that the LFD in the system could measure a liquid film of 0.25 μm at the thinnest. We made simultaneous measurements of the interface in fluorocarbon tubes of 0.5 and 1 mm I.D. using the LFD and a high-speed video camera with a microscope. These showed that the LFD could measure the interface of a liquid film with high spatial and temporal resolution during annular, slug, and piston flow regimes. The data also clarified the existence of a thin liquid film less than 1 μm in thickness in slug and annular flow regimes.

关键词： flow measurement laser-aided diagnostics laser focus displacement meter interface microchannel minichannel

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