In order to investigate the structure parameters evolution characteristics during flow regime transition process in slug flow, the vertical upward slug flow experiment in a wide range of liquid superficial velocity (0.03 < jl < 1.6 m/s) were conducted in a tubular test section with the inside diameter of 25.4 mm. Impedance void meters were employed to measure the void fraction of separated two parts corresponding to Taylor bubble and liquid slug. The present research studied the evolution of length ratio and void fraction in slug unit by keeping the liquid superficial velocity constant while increasing gas flow rate. New structure of slug unit in strong relation with transition process was observed. In specific, it was realized that the proportion of such special structure unit played an important role in transition from slug flow to churn-turbulent flow. The existing transition criteria from slug flow to churn-turbulent flow in upward two-phase flow (entrance effects model, flooding model, wake effects model, bubble coalescence model and Helmholtz instability model) were compared with the experimental identified results obtained by a new objective flow regime identification method, ReliefF-FCM algorithm. The results indicate that the transition model based on the wake effects could be the most appropriate choice to describe the mechanism of transition from slug flow to churn-turbulent flow in present experimental conditions.
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2017 25th International Conference on Nuclear Engineering
July 2–6, 2017
Shanghai, China
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5787-8
PROCEEDINGS PAPER
Investigation of Slug Flow Structure in Terms of Flow Regime Transition in Co-Current Two-Phase Flow
Muhao Zhang,
Muhao Zhang
Chongqing University, Chongqing, China
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Liang-ming PAN,
Liang-ming PAN
Chongqing University, Chongqing, China
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Peng Ju,
Peng Ju
China Nuclear Power Technology Research Institute Co., Ltd, Shenzhen, China
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Mamoru Ishii
Mamoru Ishii
Purdue University, West Lafayette, IN
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Muhao Zhang
Chongqing University, Chongqing, China
Liang-ming PAN
Chongqing University, Chongqing, China
Peng Ju
China Nuclear Power Technology Research Institute Co., Ltd, Shenzhen, China
Mamoru Ishii
Purdue University, West Lafayette, IN
Paper No:
ICONE25-67373, V009T15A047; 8 pages
Published Online:
October 17, 2017
Citation
Zhang, M, PAN, L, Ju, P, & Ishii, M. "Investigation of Slug Flow Structure in Terms of Flow Regime Transition in Co-Current Two-Phase Flow." Proceedings of the 2017 25th International Conference on Nuclear Engineering. Volume 9: Student Paper Competition. Shanghai, China. July 2–6, 2017. V009T15A047. ASME. https://doi.org/10.1115/ICONE25-67373
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