Thermally Stratified Sodium Channel Flow: Turbulence and Modelization
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
A12-3 Thermalhydraulics of Low Prandtl-Number (Liquid Metal) Flows (II)

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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