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

Schumm, T.; Frohnapfel, B; Marocco, L.

Abstract:
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 turbule ... mehr


Zugehörige Institution(en) am KIT Institut für Kern- und Energietechnik (IKET)
Institut für Strömungsmechanik (ISTM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1088/1742-6596/745/3/032051
ISSN: 1742-6588, 1742-6596
URN: urn:nbn:de:swb:90-633371
KITopen ID: 1000063337
HGF-Programm 32.01.13; LK 01
Erschienen in Journal of physics / Conference Series
Band 745
Heft 3
Seiten Art. Nr.: 032051
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
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