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Simulation of a turbulent rod bundle flow at a low molecular Prandtl number

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.980
pages 926-933

T. Baumann
Institute of Fluid Mechanics, Karlsruhe Institute of Technology, Kaiserstr. 10, D-76131 Karlsruhe, Germany

Simon Taufall
Institute for Nuclear and Energy Technology, Karlsruhe Institute of Technology, Eggensteiner Str., D-76344 Eggenstein-Leopoldshafen, Germany

Herbert Oertel jr.
Institute of Fluid Mechanics, Karlsruhe Institute of Technology, Kaiserstr. 10, D-76131 Karlsruhe, Germany

Robert Stieglitz
Institute for Neutron Physics and Reactor Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany

Thomas Wetzel
Karlsruhe Institute of Technology, Institute of Thermal Process Engineering, Kaiserstr. 12, 76131 Karlsruhe, Germany


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.

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