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International Journal of Fluid Mechanics Research
ESCI SJR: 0.22 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v25.i1-3.200
pages 230-242

The Effect of a Spacer Grid Mixing Vane on the Critical Heat Flux for a Rod Bundle

Joon Sik Lee
School of Mechanical and Aerospace Engineering, Seoul National University, San 56-1. Sillim-dong Gwanak-gu. Seoul 151-742 Korea
J. H. Park
Department of Mechanical Engineering, Seoul National University, Seoul, Korea
M. Gros d'Aillon
Laboratory d'Etude Thermohydrauliques des Assemblages Combustibles, Centre d'Etudes Nucleaires de Grenoble, Grenoble Cedez, France

ABSTRACT

The present study experimentally investigates the critical heat flux for a 5 × 5 rod bundle as a simple model for an actual PWR fuel assembly. Tests were performed for the 25 rod bundle with and without mixing vanes of spacer grids to evaluate the effect of mixing vanes on the critical heat flux. The enthalpy distribution among the subchannels and turbulent mixing coefficient were obtained by single-phase flow tests, and the effect of the mixing vanes on the critical heat flux was examined by two-phase flow tests for various inlet subcooling, mass flux and pressure conditions. The results show that the effect of the mixing vanes on the critical heat flux is more dominant in the subcooled or bubbly flow regime than in the slug or annular flow regime. The mixing vane gives the positive effect by generating the swirling flow and turbulent inter-channel mixing, and by agitating bubbles from the wall for all the flow conditions, on the other hand, it also incurs the negative effect by thinning and destroying the liquid film as a result of increasing the entrainment at the annual flow condition and by the blockage-like behavior at the high mass flux condition.


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