Journal
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY
Volume 55, Issue 3, Pages 239-253Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00223131.2017.1394230
Keywords
Lead-bismuth eutectic; two-phase flow; surface wettability; drift-flux model; void fraction; liquid velocity; bubble column; accelerator-driven system
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Funding
- [16K06959]
- Grants-in-Aid for Scientific Research [16K06959] Funding Source: KAKEN
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Lead-bismuth two-phase flow in a cylindrical vessel and annulus was experimentally investigated by varying the surface wettability of the vessel wall. The test section used in this study was a cylindrical stainless vessel with/without inner sleeve to change the hydraulic diameter. Volume-averaged void fraction was measured by varying the surface wettability of the test section, which was enhanced by using a soldering flux. Measured void fraction was compared with existing two-phase flow correlations and with one-dimensional theoretical simulations assuming one-dimensional drift-flux model. From experimental results, measured distribution parameters of the lead-bismuth two-phase flow are much larger than that of ordinary two-phase flow regardless of the surface wettability. In the present work, the one-dimensional analysis was carried out for the cylindrical vessel to reproduce the distribution parameter. From the simulation results, predicted value for the cylindrical vessel showed good agreement with experimental results. However, in annulus, the distribution parameters in annulus were underestimated by the present model. It was suggested that, in case of annulus, steeper void fraction profile might be formed near the inner surface for poor wettability condition.
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