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1. Pressure Fluctuation Characteristics of the Short-Radius Elbow Pipe for FBR in the Postcritical Reynolds Regime

Author

Tadashi SHIRAISHI, Hisato WATAKABE, Hiromi SAGO, and hidemasa YAMANO

Subjects
japan sodium-cooled fast reactor, hot leg, short-radius elbow pipe, fluctuating pressure, postcritical reynolds regime, flow separation, statistical examination, Science (General), Q1-390, Technology
Abstract

For the Japan Sodium-cooled Fast Reactor, an experimental study on the fluctuating pressure of the hot legs was carried out with tests using a 1/3-scale model. The total resistance coefficient is consistent with the published data, and our research has given some additional data up to the Reynolds number of 8.0x106. The flow pattern in the postcritical regime is independent of a Reynolds number. The statistical examination revealed that fluctuating pressures on the pipe wall depend on the mean velocity but not on the viscosity of the fluid. Negative spikes of pressure appeared for high velocity. Based on these experimental data it is concluded that, there are similarity laws for the scale of a model and the property of fluid, but not for the velocity in the pipe. Theoretical considerations also gave a discussion how to extrapolate the fluctuating pressure to the actual hot-leg conditions.

Published
2009
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2. Pressure Fluctuation Characteristics of the Short-Radius Elbow Pipe for FBR in the Postcritical Reynolds Regime

Author

Hisato Watakabe, Hiromi Sago, Hidemasa Yamano, and Tadashi Shiraishi

Subjects
Technology, Science (General), Thermodynamics, Physics::Fluid Dynamics, Flow separation, Viscosity, symbols.namesake, Q1-390, Fluid dynamics, Navier–Stokes equations, fluctuating pressure, Fluid Flow and Transfer Processes, Physics, Turbulence, hot leg, postcritical reynolds regime, Mechanical Engineering, Reynolds number, Mechanics, japan sodium-cooled fast reactor, statistical examination, Reynolds decomposition, flow separation, symbols, Scale model, short-radius elbow pipe
Abstract

For the Japan Sodium-cooled Fast Reactor, an experimental study on the fluctuating pressure of the hot legs was carried out with tests using a 1/3-scale model. The total resistance coefficient is consistent with the published data, and our research has given some additional data up to the Reynolds number of 8.0x106. The flow pattern in the postcritical regime is independent of a Reynolds number. The statistical examination revealed that fluctuating pressures on the pipe wall depend on the mean velocity but not on the viscosity of the fluid. Negative spikes of pressure appeared for high velocity. Based on these experimental data it is concluded that, there are similarity laws for the scale of a model and the property of fluid, but not for the velocity in the pipe. Theoretical considerations also gave a discussion how to extrapolate the fluctuating pressure to the actual hot-leg conditions.

Published
2009

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