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Report No.
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Unsteady hydraulic characteristics in pipe with elbow under high Reynolds condition

Ono, Ayako; Kimura, Nobuyuki; Kamide, Hideki; Tobita, Akira

In the design of Japan Sodium-cooled Fast Reactor (JSFR), the flow-induced vibration (FIV) has been studied for the large-diameter hot-leg pipe with a short-elbow. The FIV will be a phenomenon caused by the pressure fluctuation in the pipe. In this study, for the purpose of clarification of FIV mechanism, the velocity and pressure fluctuations in the elbow pipe were measured. It was found that the pressure fluctuation on the wall with elbow was closely related with the movement of separation region formed near the elbow outlet.

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