CFD investigation of a JAEA 7-pin fuel assembly experiment with local blockage for SFR
| Autor: | Min-Seop Song, Jae-Ho Jeong |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Pressure drop
Materials science Convective heat transfer business.industry Turbulence RANS TK9001-9401 Mechanics Cladding (fiber optics) Vortex Physics::Fluid Dynamics Local blockage SFR Nuclear Energy and Engineering Heat transfer Turbulence kinetic energy Nuclear engineering. Atomic power CFD business Thermal energy |
| Zdroj: | Nuclear Engineering and Technology, Vol 53, Iss 10, Pp 3207-3216 (2021) |
| ISSN: | 1738-5733 |
| Popis: | Three-dimensional structures of a vortical flow field and heat transfer characteristics in a partially blocked 7-pin fuel assembly mock-up of sodium-cooled fast reactor have been investigated through a numerical analysis using a commercial computational fluid dynamics code, ANSYS CFX. The simulation with the SST turbulence model agrees well with the experimental data of outlet and cladding wall temperatures. From the analysis on the limiting streamline at the wall, multi-scale vortexes developed in axial direction were found around the blockage. The vortex core has a high cladding wall temperature, and the attachment line has a low cladding wall temperature. The small-scale vortex structures significantly enhance the convective heat transfer because it increases the turbulent mixing and the turbulence kinetic energy. The large-scale vortex structures supply thermal energy near the heated cladding wall surface. It is expected that control of the vortex structures in the fuel assembly plays a significant role in the convective heat transfer enhancement. Furthermore, the blockage plate and grid spacer increase the pressure drop to about 36% compared to the bare case. |
| Databáze: | OpenAIRE |
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