Unsteady Elbow Pipe Flow to Develop a Flow-Induced Vibration Evaluation Methodology for Japan Sodium-Cooled Fast Reactor

Yamano, Hidemasa; Tanaka, Masaaki; Murakami, Takahiro; Iwamoto, Yukiharu; Yuki, Kazuhisa; Sago, Hiromi; Hayakawa, Satoshi

doi:10.3327/jnst.48.677

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…This accumulation of bubbles can increase the possibility of a bubble collision and subsequently alter the interfacial heat and mass transfers. Furthermore, when the curvature radius of an elbow is small enough to create a fluctuating flow after the elbow, the downstream pipe can undergo oscillating mechanical stress, which can lead to structural fatigue in the piping system (Yamano et al, 2009). In the past, several researchers have investigated turbulent flows in pipes with elbows by means of theoretical, experimental, and numerical methods.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Secondary Flow Induced by 90-Degree Elbow in Turbulent Pipe Flow

Kim

Yadav

Kim

2014

Engineering Applications of Computational Fluid Mechanics

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The purpose of this study is to characterize the swirling secondary flow in the downstream of a pipe bend using a numerical simulation of the flow. The CFD (Computational Fluid Dynamics) software OpenFOAM is used to simulate the turbulent flow in pipes with elbow. Various turbulence models are benchmarked with the existing experimental data and a comparative study is performed to select an appropriate turbulence model for the analysis. Predictions made by the selected turbulence model are compared with the LDA (Laser Doppler anemometer) measurements from the experiments currently conducted to find the dependency of the flows on the Reynolds number. It is found that the swirl intensity of the secondary flow is a strong function of the radius of curvature of the bend and a weak function of the Reynolds number. Additionally, it is found that the dissipation of the swirl intensity is exponential in nature.

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Section: Introductionmentioning

confidence: 99%

Characteristics of Secondary Flow Induced by 90-Degree Elbow in Turbulent Pipe Flow

Kim

Yadav

Kim

2014

Engineering Applications of Computational Fluid Mechanics

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“…This experiment indicated no dependence on the pipe scale. (2) Since no dependence on the coolant velocity, viscosity and pipe scale was observed in these experiments, it can be concluded that there is no dependence on Reynolds number in the post-critical regime (from ~3 × 10 5 to ~8 × 10 6 ). Therefore, application to the JSFR hot-leg pipe condition (Re = ~4 × 10 7 ) is possible based on the assumption of analogy.…”

Section: Introductionmentioning

confidence: 69%

Effect of Swirl Inflow on Flow Pattern and Pressure Fluctuation onto a Single-Elbow Pipe in Japan Sodium-Cooled Fast Reactor

Yamano

Sago

Hirota

et al. 2012

JFST

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As part of the development of a flow-induced vibration evaluation methodology for the primary cooling piping in Japan sodium-cooled fast reactor, important factors were discussed in evaluating the flow-induced vibration for the hot-leg piping. To investigate a complex flow near the inlet of the hot-leg piping, a steady-state numerical analysis was carried out for the reactor upper plenum flow, which was simulated in a 1/10-scale reactor upper plenum experiment. Based on this analysis, experimental conditions on swirl inflow and deflected inflow that were identified as important factors were determined for flow-induced vibration experiments simulating only the hot-leg piping. In this study, the effect of the swirl inflow on flow pattern and pressure fluctuation onto the pipe wall was investigated in a 1/3-scale hot-leg pipe experiment. The experiment has indicated less significant for the pressure fluctuations, while the flow separation region was slightly influenced by the swirl inflow. Computational fluid dynamics simulation with a U-RANS approach results also appear in this paper. Through the simulations under the swirl inflow conditions of 0% and 5%, the validity of the U-RANS simulation was confirmed by comparison to the 1/3-scale hot-leg piping experiments.

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Development of flow-induced vibration evaluation methodology for large-diameter piping with elbow in Japan sodium-cooled fast reactor

Yamano

Tanaka

Kimura

et al. 2011

Nuclear Engineering and Design

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Unsteady Elbow Pipe Flow to Develop a Flow-Induced Vibration Evaluation Methodology for Japan Sodium-Cooled Fast Reactor

Cited by 3 publications

References 2 publications

Characteristics of Secondary Flow Induced by 90-Degree Elbow in Turbulent Pipe Flow

Characteristics of Secondary Flow Induced by 90-Degree Elbow in Turbulent Pipe Flow

Effect of Swirl Inflow on Flow Pattern and Pressure Fluctuation onto a Single-Elbow Pipe in Japan Sodium-Cooled Fast Reactor

Development of flow-induced vibration evaluation methodology for large-diameter piping with elbow in Japan sodium-cooled fast reactor

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