Evaluation of structural effect of BWR spacers on droplet flow dynamics
| Autor: | Tsugumasa Iiyama, Riichiro Okawa, Takahiro Arai, Masahiro Furuya |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Nuclear and High Energy Physics
Drag coefficient Materials science 020209 energy Flow (psychology) 02 engineering and technology Computational fluid dynamics 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics symbols.namesake 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Froude number General Materials Science Safety Risk Reliability and Quality Dispersion (water waves) Waste Management and Disposal Range (particle radiation) business.industry Mechanical Engineering technology industry and agriculture Ferrule Mechanics eye diseases Nuclear Energy and Engineering symbols Particle business |
| Zdroj: | Nuclear Engineering and Design. 377:111155 |
| ISSN: | 0029-5493 |
| DOI: | 10.1016/j.nucengdes.2021.111155 |
| Popis: | We have established an experimental system to visualize a droplet flow in a simulated BWR fuel sub-channel optically and measure the diameter and velocity of droplet after passing through a spacer. For representative spacers of ferrule and grid type, an effect of them on downstream droplets was evaluated with the experimental system. When a ferrule type spacer was simulated and implemented in both the center and side sub-channel, the vertical velocity of droplets got faster especially in the range of small diameter compared to the case of no spacer. When a grid type spacer was simulated and implemented in the center sub-channel especially, a large dispersion of vertical velocity of droplets occurred especially in the range of small diameter compared to the case of no spacer. By a computational fluid dynamics analysis for gas phase flow to drive the droplets in the sub-channel, it was confirmed qualitatively that the characteristics of droplet behavior observed in this experiment were dependent on the structure and geometry of spacer and sub-channel. Furthermore, it was revealed that a relation between a droplet diameter and velocity can be organized with a non-dimensional function derived from a momentum equation of particle in driving fluid and its drag coefficient has linear correlation with a gas Froude number. |
| Databáze: | OpenAIRE |
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