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Numerical simulation of the turbulent convective buoyant flow of sodium over a backward- facing step

Schumm, T. 1; Frohnapfel, B. ORCID iD icon 1; Marocco, L. 2
1 Institut für Strömungsmechanik (ISTM), Karlsruher Institut für Technologie (KIT)
2 Institut für Kern- und Energietechnik (IKET), Karlsruher Institut für Technologie (KIT)


A forced convective and a buoyancy-aided turbulent liquid sodium flow over a backward-facing step with a constant heat flux applied on the indented wall is simulated. Linear eddy viscosity models are used for the Reynolds stresses. Turbulent heat fluxes are modelled with a single gradient diffusion hypotheses with two different approaches to evaluate the turbulent Prandtl number. Moreover, the inuence of turbulence on heat transfer to sodium is also assessed through simulations with zero turbulent thermal diffusivity. The results are compared with DNS data from literature. The velocity and turbulent kinetic energy profiles predicted by all models are in good agreement with the DNS data. The local Nusselt number trend is qualitatively well captured, however, its magnitude is underestimated by all models for the mixed convection case. For forced convection, the heat transfer is overestimated by all heat flux models. The simulation with neglected turbulent heat transfer shows the best overall agreement for the forced convection case. For the mixed convection best agreement is obtained using a correlation to locally evaluate the turbulent thermal diffusivity.

Volltext §
DOI: 10.5445/IR/1000063337
DOI: 10.1088/1742-6596/745/3/032051
Zitationen: 12
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Kern- und Energietechnik (IKET)
Institut für Strömungsmechanik (ISTM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 1742-6588, 1742-6596
KITopen-ID: 1000063337
HGF-Programm 32.01.13 (POF III, LK 01) Transmutation: Flüssigmetalltechnologie
Erschienen in Journal of physics / Conference Series
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 745
Heft 3
Seiten Art. Nr.: 032051
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