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International Heat Transfer Conference 10

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

EXPERIMENTAL INVESTIGATIONS AND NUMERICAL SIMULATIONS OF THREE-DIMENSIONAL TEMPERATURE AND VELOCITY FIELDS IN THE TRANSITION REGION FROM LAMINAR FORCED TO NATURAL CONVECTION

D. Weinberg
Kernforschungszentrum Karlsruhe GmbH (KfK) Institut fur Angewandte Thermo- und Fluiddynamik (IATF) Postfach 3640, D-76021 Karlsruhe, Federal Republic of Germany

H. Hoffmann
Kernforschungszentrum Karlsruhe GmbH (KfK) Institut fur Angewandte Thermo- und Fluiddynamik (IATF) Postfach 3640, D-76021 Karlsruhe, Federal Republic of Germany

K. Rust
Kernforschungszentrum Karlsruhe GmbH (KfK) Institut fur Angewandte Thermo- und Fluiddynamik (IATF) Postfach 3640, D-76021 Karlsruhe, Federal Republic of Germany

DOI: 10.1615/IHTC10.3450
pages 585-590

Abstract

Thermal-hydraulic experiments were performed with water in order to simulate the decay heat removal by natural convection in a pool type sodium-cooled reactor. Two test rigs of different scales were used, namely RAMONA (1:20) and NEPTUN (1:5). RAMONA served to study the transition from nominal operation by forced convection to decay heat removal operation by natural convection. Steady-state similarity tests were carried out in both facilities. These data provide a broad basis for the verification of computer programs. Numerical analyses performed with the three-dimensional FLUTAN code indicated that the thermal hydraulic processes can be quantitatively simulated even for the very complex geometry of the NEPTUN test rig.

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