Study on Turbulent Modeling in Gas Entrainment Evaluation Method
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概要
- 論文の詳細を見る
Suppression of gas entrainment (GE) phenomena caused by free surface vortices are very important to establish an economically superior design of the sodium-cooled fast reactor in Japan (JSFR). However, due to the non-linearity and/or locality of the GE phenomena, it is not easy to evaluate the occurrences of the GE phenomena accurately. In other words, the onset condition of the GE phenomena in the JSFR is not predicted easily based on scaled-model and/or partial-model experiments. Therefore, the authors are developing a CFD-based evaluation method in which the non-linearity and locality of the GE phenomena can be considered. In the evaluation method, macroscopic vortex parameters, e.g. circulation, are determined by three-dimensional CFD and then, GE-related parameters, e.g. gas core (GC) length, are calculated by using the Burgers vortex model. This procedure is efficient to evaluate the GE phenomena in the JSFR. However, it is well known that the Burgers vortex model tends to overestimate the GC length due to the lack of considerations on some physical mechanisms. Therefore, in this study, the authors develop a turbulent vortex model to evaluate the GE phenomena more accurately. Then, the improved GE evaluation method with the turbulent viscosity model is validated by analyzing the GC lengths observed in a simple experiment. The evaluation results show that the GC lengths analyzed by the improved method are shorter in comparison to the original method, and give better agreement with the experimental data.
著者
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ITO Kei
Advanced Nuclear System Research and Development Directorate, Japan Atomic Energy Agency
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Ito Kei
Advanced Nuclear System Res. And Dev. Directorate Japan Atomic Energy Agency
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Ohshima Hiroyuki
Advanced Nuclear System Res. And Dev. Directorate Japan Atomic Energy Agency
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IMAI Yasutomo
NDD Corporation
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NAKAMINE Yoshiaki
NDD Corporation
関連論文
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- Computational Methodology of Sodium-Water Reaction Phenomenon in Steam Generator of Sodium-Cooled Fast Reactor
- Computational Sensitivity Study on Sodium-Water Reaction Phenomenon
- Estimation of Heat Transfer Coefficient and Flow Characteristics on Heat Transfer Tube in Sodium-Water Reaction
- Appropriate Formulations for Velocity and Pressure Calculations at Gas-liquid Interface with Collocated Variable Arrangement
- Theoretical Study of Sodium-Water Surface Reaction Mechanism
- Two-Phase Flow Simulation of Gas Entrainment Phenomena in Large-Scale Experimental Model of Sodium-Cooled Fast Reactor (Selected Papers of the Joint International Conference of Supercomputing in Nuclear Applications and Monte Carlo : SNA + MC 2010)
- Study on Turbulent Modeling in Gas Entrainment Evaluation Method
- Kinetic Study of Sodium-Water Surface Reaction by Differential Thermal Analysis