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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

ON THE MODELING OF HEAT TRANSFER TO SODIUM IN A PIPE UNDER MIXED CONVECTION AND DEVELOPING FLOW CONDITION WITH EMPIRICAL MODELS

Wadim Jaeger
Karlsruhe Institute of Technology, IFRT, Kaiserstrasse 12, 76131 Karlsruhe, Germany

Wolfgang Hering
Karlsruhe Institute of Technology, INR, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein- Leopoldshafen, Germany

DOI: 10.1615/IHTC16.cov.021277
pages 3207-3214


キーワード: Convection, Nuclear energy, Liquid metal, Mixed-convection, Empirical models

要約

The heat transfer to liquid sodium under mixed convection and developing flow conditions is studied. Owing to the effect of these conditions on the heat transfer, a thorough analysis is needed for the design, operation and safety demonstration of e.g. nuclear reactor system components. Currently, the analysis of nuclear reactors operated with liquid metal by means of best-estimate system codes is limited to forced convection and developed flow conditions. Thereby, empirical models for the Nusselt number are used to predict the heat transfer behavior. The heat transfer under non-forced convective conditions, during transitional regimes and in the presence of local flow perturbations are open question. In this contribution, an experiment for the heat transfer to sodium flowing in a vertical pipe under mixed convection conditions with developing flow is used to derive an empirical model. The experimental data are reviewed and an empirical model based on the Péclet number and a buoyancy parameter is developed. The new model predicts the experimental data very well from a qualitative and quantitative point of view for several Péclet numbers and buoyancy parameters. Based on this investigation, the provided empirical model can be used to calculate e.g. transient behavior in liquid metal operated components with best-estimate system codes.

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