Experimental studies were made on the multi-dimensional behavior of upward gas-liquid two-phase flow through the vertical round tube with an axisymmetric sudden expansion, which is one of the typical multi-dimensional channel geometry. The aims of this study are to clarify the multi-dimensional behavior of bubbly or slug flow affected by sudden expansion channel geometry, and to accumulate the experimental data for two-phase flow analysis, which is applicable to predict with appropriate accuracy the multi-dimensional its behavior. The direct observation using high-speed video camera was performed and revealed the multi-dimensional dynamic flow behavior with bubbles and gas-slug affected by the sudden expansion part (20 mm-tube to 50 mm-tube). The characteristic phenomena were observed such as bubble break-up, deformation due to the strong shear of liquid flow, or liquid micro jet penetration through the gas-slug, and so on. From these results, the flow regime map and the flow patterns at the below and above of the sudden expansion part were classified in relation to the bubble diameter. Additionally, the measurement of the void fraction profiles in the tube cross sections of sudden expansion were conducted at the different axial positions. The void fraction was measured using a point-electrode resistivity probe. The void fraction measurements in this study showed in detail that how the two phase flow develops along the direction of the downstream of the sudden expansion. In just above the sudden expansion, the void fraction distribution appeared the wall peak or the core peak in void fraction in the upstream of the sudden expansion. In the downstream of the sudden expansion, the void fraction distribution changes from a saddle shape or power-low shape into finally the saddle shape as the bubbly flow develops along the downstream of the sudden expansion. These experimental data in the sudden expansion of a vertical upward bubbly flow would become benchmark with respect to the multi-dimensional behavior of the two-phase flow analysis.
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10th International Conference on Nuclear Engineering
April 14–18, 2002
Arlington, Virginia, USA
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
0-7918-3597-9
PROCEEDINGS PAPER
Flow Patterns of Gas-Liquid Two-Phase Flow in Round Tube With Sudden Expansion
Koichi Kondo,
Koichi Kondo
Marine Technical College, Ashiya, Hyogo, Japan
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Kenji Yoshida,
Kenji Yoshida
Osaka University, Suita, Osaka, Japan
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Tadayoshi Matsumoto,
Tadayoshi Matsumoto
Osaka University, Suita, Osaka, Japan
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Tomio Okawa,
Tomio Okawa
Osaka University, Suita, Osaka, Japan
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Isao Kataoka
Isao Kataoka
Osaka University, Suita, Osaka, Japan
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Koichi Kondo
Marine Technical College, Ashiya, Hyogo, Japan
Kenji Yoshida
Osaka University, Suita, Osaka, Japan
Tadayoshi Matsumoto
Osaka University, Suita, Osaka, Japan
Tomio Okawa
Osaka University, Suita, Osaka, Japan
Isao Kataoka
Osaka University, Suita, Osaka, Japan
Paper No:
ICONE10-22154, pp. 179-186; 8 pages
Published Online:
March 4, 2009
Citation
Kondo, K, Yoshida, K, Matsumoto, T, Okawa, T, & Kataoka, I. "Flow Patterns of Gas-Liquid Two-Phase Flow in Round Tube With Sudden Expansion." Proceedings of the 10th International Conference on Nuclear Engineering. 10th International Conference on Nuclear Engineering, Volume 3. Arlington, Virginia, USA. April 14–18, 2002. pp. 179-186. ASME. https://doi.org/10.1115/ICONE10-22154
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