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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

STUDY OF THE CRITICAL HEAT FLUX CONDITION AT CONVECTIVE BOILING OF WATER: TEMPERATURE AND POWER CONTROLLED EXPERIMENTS

Get access (open in a dialog) DOI: 10.1615/IHTC9.110
pages 63-68

Abstract

The critical heat flux (CHF) and its corresponding wall superheat during vertical tube flow of subcooled water has been measured at conditions of low flow (≤300 kg/(m2s)), pressure (≤1.2 MPa) and relative length (L/D = 4.47) performing temperature-controlled experiments. Identical results for CHF were obtained when operating the heat transfer system under power-controlled conditions. The data are presented in terms of a table and accurate empirical correlations following Katto's generalized correlation scheme. Taking into account previous CHF data at L/D ≤ 100 and same range of flow conditions the length effect was found to further depend on pressure and mass flux. The data for the wall superheat show a distinct dependence upon pressure, mass flux and inlet quality that has not been observed before with comparable clarity.