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MEASUREMENTS AND PREDICTIONS OF HEAT AND MASS TRANSFER FROM A HOT SODIUM POOL IN AN ARGON FILLED ENCLOSURE

G. Costigan
Department of Engineering Sciences, Oxford University, Parks Road, Oxford, UK

D.N. Roberts
AEA Industrial Technology Harwell, Oxfordshire OX11 ORA

Y. L. Sinai
Consultancy Services, AEA Technology, Culham, Oxon, OX14 3DB

Abstract

In pool type sodium cooled fast reactors, heat transfer from the hot sodium pool to the underside of the cooled roof occurs by natural convection and radiation across an argon filled space. The strong variation of sodium vapour pressure with temperature ensures that there is also significant mass transfer. Measurements of heat and mass transfer from a hot sodium pool to a cooled roof have been made in a 0.6 m diameter cylindrical vessel. Results are reported for a range of boundary conditions relevant to fast reactor operation.
The trends in the mass transfer measurements can be well described by a heat and mass transfer analogy calculation method originally proposed by Clement and Hawtin (1976) and developed with co-workers (Ford and Clement 1990); but this is only true if the aerosol is considered optically thin. Radiative heat transfer to the roof is a significant component of the total. The fact that sodium aerosols can form in the argon cover gas makes radiation calculations difficult. Heat transfer data have been compared with predictions made by the C-GAS code (Sinai et al 1993) using three-dimensional radiation results from RAD3D (Guilbert 1989) as input. Excellent agreement was obtained using plausible values of surface emissivities.

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