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http://dx.doi.org/10.6110/KJACR.2013.25.5.246

Flow Characteristics of a Gas-Liquid Slug Flow in Small Vertical Tubes  

Kye, Seok-Hyun (Department of Mechanical Engineering, Graduate School of Korea National University of Transportation)
Kim, Dong-Seon (Department of Mechanical Engineering, Korea National University of Transportation)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.25, no.5, 2013 , pp. 246-254 More about this Journal
Abstract
Some characteristics of nitrogen-water slug flow were optically measured, in vertical acrylic tubes of 2, 5 and 8 mm diameter. Bubble velocity, bubble and unit cell lengths were measured, by analyzing the light intensity signals from two sets of dot laser-infrared sensor modules mounted along the transparent tubes. Optical images of the bubbles were also taken and analyzed, to measure bubble shapes and liquid film thickness. It was found that the measured bubble velocities were in good agreement with the empirical models in the literature, except for those measured under high superficial velocity condition in the 2 mm tube. Bubble length was found to be the longest in the 2 mm tube, being 4 to 5 times those of the other tubes. Liquid film was found to have developed early in the 2 mm tube, which made the blunt shape of the bubble head. Liquid film thickness in the 8 mm tube was measured at almost twice those of the other tubes.
Keywords
Slug flow; Tube diameter; Bubble velocity; Bubble length; Film thickness;
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Times Cited By KSCI : 1  (Citation Analysis)
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