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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

CONVECTIVE TRANSITION BOILING OF WATER AT MEDIUM PRESSURE

Get access (open in a dialog) DOI: 10.1615/IHTC9.4310
pages 35-40

Abstract

An experimental study of forced convective boiling heat transfer for upflow of water in a circular tube has been performed using a heat transfer system with temperature-controlled indirect Joule heating. In this way, complete boiling curves from incipience of boiling to film boiling could be measured including the transition boiling regime. The main body of the results covers the pressure range from 0.1 to 1 MPa, mass flux range from 25 to 200 kg/(m2s) and inlet subcooling from 5 to 30 K.
The experimental data in the transition region were correlated in terms of a heat flux/wall superheat relationship that was normalized by the maximum heat flux and its corresponding wall superheat, respectively, to anchor the transition boiling curve to its low temperature limit. The exponent n in this power law relation was assumed to depend on the ratio of phase densities, normalized wall superheat and inlet subcooling as well as dimensionless mass flux. The correlation predicts the transition boiling heat flux with a rms error of 17.6 % if compared to 1094 data points.