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Research Papers: Nuclear Power

Experimental Study on Gas Entrainment Due to Nonstationary Vortex in a Sodium Cooled Fast Reactor—Comparison of Onset Conditions Between Sodium and Water

[+] Author and Article Information
Nobuyuki Kimura, Toshiki Ezure, Hiroyuki Miyakoshi, Hideki Kamide

 Japan Atomic Energy Agency, Oarai, Ibaraki 311-1393, Japan

Takeshi Fukuda

 Osaka University, Suita, Osaka 565-0871, Japan

J. Eng. Gas Turbines Power 132(10), 102908 (Jul 06, 2010) (6 pages) doi:10.1115/1.4000621 History: Received July 27, 2009; Revised August 03, 2009; Published July 06, 2010; Online July 06, 2010

An innovative sodium cooled fast reactor has been investigated as part of the fast reactor cycle technology development project. In the reactor, a compact reactor vessel (R/V) with increased sodium flow velocity was designed to reduce the construction cost. One of the thermal hydraulic problems in this design is gas entrainment at the free surface in the R/V. In most of past studies, water experiments were performed to investigate the gas entrainment in the reactor. It is necessary to evaluate an influence of fluid physical property on the gas entrainment phenomena. In this study, sodium experiments were carried out to clarify the onset criteria of the gas entrainment due to a free surface vortex. Water experiments using a test section in which geometry is the same as that in the sodium tests were also performed. The gas entrainment in water slightly tended to take place in comparison with that in sodium under low velocity conditions. Overall, the onset condition map on the lateral and downward flow velocities in the sodium and water experiments were in good agreement.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Overview of Japan sodium cooled fast reactor

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Figure 2

Experimental loop in water

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Figure 3

Schematic of test section

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Figure 4

Experimental loop in sodium

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Figure 5

Judgment procedure of gas entrainment in sodium experiment

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Figure 6

Photo of sodium charge process

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Figure 7

Relationship between circulation and shape of gas core (Case-9)

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Figure 8

Gas entrainment phenomena in large scale model experiment

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Figure 9

Onset condition map of gas entrainment in water and sodium experiments

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Figure 10

Visualized images of free surface in water and sodium experiments

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