Conference Proceedings Paper
Thermally Stratified Sodium Channel Flow: Turbulence and Modelization
NURETH-14 - 2011 September 25-30
Marco Pellegrini (Tokyo Institute of Technology)
Hiroshi Endo (Japan Nuclear Energy Safety Organization)
Hisashi Ninokata (Tokyo Institute of Technology)
Numerical simulation of sodium stratification in open channel flow has been studied with
Computational Fluid Dynamics (CFD) employing an Algebraic Heat Flux Model (AHFM)
closure for the turbulent heat flux. The results are validated against experimental data and the
AHFM is compared with the simplified Reynolds analogy employing a constant turbulent Pr
number. Influence of buoyancy on turbulence created in the mixing layer has been evaluated and
its influence on the momentum and energy transport in the vertical direction assessed. It has been
found that the choice of turbulent heat flux model influences the achieved results for temperature
and velocity field which might affect the flow developing and persistence of stratification in the
channel. Moreover both experiment and validation show the possibility of creation of a strong
stratification also for low Pr number fluids, warning the stratification problem as an existing
phenomenon likely to occur in liquid metal nuclear power plants
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