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Início Arquivos Thermal Letter Representantes Futuras reuniões Assembléia das Conferências Internacionais de Transferência de Calor
International Heat Transfer Conference 8

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

THE CONDENSING CHARACTERISTICS OF NITROGEN IN PLAIN, BRAZED ALUMINIUM, PLATE-FIN HEAT-EXCHANGER PASSAGES

J. M. Robertson
Heat Transfer and Fluid Flow Service (HTFS), Atomic Energy Research Establishment, Harwell, Oxfordshire 0X11 ORA, UK

N. Blundell
Thermal Hydraulics Division, Harwell Laboratory, Oxfordshire, England

R. H. Clarke
Thermal Hydraulics Division, Harwell Laboratory, Oxfordshire, England

DOI: 10.1615/IHTC8.200
pages 1719-1724

Resumo

Condensing heat transfer coefficients and pressure gradients have been obtained with nitrogen in vertical downflow in a plain, plate-fin test section for a range of low mass fluxes and pressures. In the paper, the measured coefficients are compared with predictions from the Nusselt and Dukler and other methods, none of which is satisfactory. A new model of condensing with a falling film is advanced: it takes into account turbulence and the shear stress variation across the film. By using a double velocity profile and the measured pressure gradients, the new method gives better predictions for these small rectangular finned channels.

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