DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal
ISBN Print: 978-1-56700-302-4
ISSN: 2377-2816
Simulation of a turbulent rod bundle flow at a low molecular Prandtl number
RESUMO
Low molecular Prandtl number liquids allow an effective convective heat transfer at highly heat loaded surfaces in many technical applications. Therefore, the reliable safe design of those often quite complex geometrical units and the presence of turbulent flows demand validated numerical Computational Fluid Dynamic (CFD) models, which account for the anisotropy of the turbulence and the different length scales of thermal and momentum field existent in low Prandtl number fluids. In this context, a new turbulent heat flux model (HFM) has been developed and validated in combination with an explicit algebraic Reynolds stress model (EARSM) at generic cases. The validated model is applied to hexogonal 19 fuel pin bundle simulator currently set-up at the KALLA laboratory. The simulation exhibits considerable temperature and velocity gradients within the assembly and hence provides a tool for a dedicated optimization process.