Two-phase slug flow across small diameter tubes with the presence of vertical return bend |
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Authors: | Chi-Chuan Wang Pi-Shan Huang |
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Affiliation: | a Energy & Resources Laboratories, Industrial Technology Research Institute, Hsinchu, 310, Taiwan b Department of Mechanical Engineering, National Yunlin University of Science and Technology, 640, Taiwan |
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Abstract: | This study examines the two-phase slug flow across small diameter tubes with the presence of vertical U-type return bends. The translational velocity of the air slug across return bend usually peaks at an angle of π/2-3π/4. The increase of translational velocity is especially pronounced when flow enters at the lower tube with a smaller curvature ratio. An approximately twofold increase of the slug velocity is observed at a curvature ratio of 3. Dimensionless correlations for flowing upwards and downwards with a mean deviation of 18.7% and 24.5% are proposed that can describe the variation of translational velocity within the return bend. |
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Keywords: | Slug flow Return bend Translational velocity |
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