ISSN Online: 2377-424X
ISBN Print: 0-89116-909-1
International Heat Transfer Conference 9
STUDY OF THE CRITICAL HEAT FLUX CONDITION AT CONVECTIVE BOILING OF WATER: TEMPERATURE AND POWER CONTROLLED EXPERIMENTS
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.