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NATURAL CONVECTION COOLING OF HOT MOLYBDENUM PLATES

DOI: 10.1615/ICHMT.2008.CHT.2440
11 pages

Mark K. M. Ho
Nuclear Analysis Section, Reactor Operations, Australian Nuclear Science and Technology Organisation, Menai, Australia 2234

Guillaume Bois
Laboratoire de Modélisation et de Développement de Logiciels, CEA Grenoble, France

Dave Wassink
Nuclear Analysis Section, Reactor Operations, Australian Nuclear Science and Technology Organisation, Menai, Australia 2234

Guan Heng Yeoh
School of Mechanical and Manufacturing Engineering, University of New South Wales; Nuclear Analysis Section, Reactor Operations, Australian Nuclear Science and Technology Organisation, Menai, Australia 2234

Abstract

As part of the safety analysis of thermohydraulic processes at ANSTO, the manufacture of molybdenum isotopes for the purpose of radiotherapy is analysed for sufficient decay heat removal under natural convection conditions. The aim of this investigation is to determine, with the aid of computational fluid dynamics, the maximum temperature of a molybdenum plate ‘target’ after irradiation in the OPAL (Open Pool Australian Light-water) research reactor. The heat transfer modelling was conducted in a finite volume formulation using the commercial CFD code CFX. Due to the ratio of plate length to plate diagonal cross section being very large, a two dimensional (2D) simulation was sufficient to reproduce the characteristic vortical formations observed during controlled experiments. Imperative to the accuracy of the calculation was the use of the Monte Carlo radiation model coupled with the SST k-ω turbulence model to numerically determine the maximum plate surface temperature within 8 Kelvin of the experimental result. Other salient features of the CFD simulations such as heat plume patterns and local velocities along the moly-plate target were also verified.

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