Modeling the Turbulent Heat Fluxes in Low Prandtl Number Shear Flows
NURETH-14 - 2011 September 25-30


Presented at:
NURETH-14
2011 September 25-30
Location:
Toronto, Canada
Session Title:
A12-2 Thermalhydraulics of Low Prandtl-Number (Liquid Metal) Flows (I)

Authors:
Thomas Baumann (Karlsruhe Institute for Technology)
André Loges (Karlsruhe Institute for Technology)
Luca Marocco (Politecnico di Milano)
Torsten Schenkel (FAU Busan, Friedrich-Alexander-Universität Erlangen-Nürnberg)
Thomas Wetzel (Karlsruhe Institute for Technology)
Robert Stieglitz (Karlsruhe Institute for Technology)
  

Abstract

Liquid metals are often considered for an effective convective heat transport in several technical applications. Since the geometric setup is in most cases quite complex, and additionally the Reynolds numbers are large, numerical simulations frequently use a Reynolds-averaged Navier- Stokes equations (RANS) approach. Hereby, the turbulent heat fluxes are applied inadequately by a constant turbulent Prandtl number . In this context, different advanced models are compared and analyzed with experimental and Direct Numerical Simulation (DNS) data, which are conceived as validated. The different simulations show an improvement of the thermal field, but also depict the influence of the eddy viscosity model for forced and mixed convective flow.

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