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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

EXPERIMENTAL STUDY OF NONEQUILI BR IUM POST-CHF HEAT TRANSFER IN ROD BUNDLES

Get access (open in a dialog) DOI: 10.1615/IHTC8.3240
pages 2417-2422

Abstract

Verifications and improvements of nonequi1ibrium heat transfer models, for post-critical-heat-flux convective boiling, has been greatly affected by the lack of experimental data regarding the degree of thermodynamic nonequilibrium. Recent studies had been successful in measuring vapor superheats in a vertical single tube. This paper extends the nonequilibrium convective boiling data to a rod bundle geometry. Vapor superheat measurements were obtained in a rod bundle with nine heated rods and a heated shroud. Tests were carried out with water at low mass fluxes with a wide range of dryout conditions. Significant nonequilibrium was observed, with vapor superheats of up to 600°C. Parametric effects of mass flux, heat flux and inlet conditions on vapor superheat are presented.