Critical heat flux at high velocity channel flow with high subcooling

A quantitative analysis of critical heat flux (CHF) in heated channels under high mass flux with high subcooling was successfully carried out by applying a new flow model to the existing CilF model of a macro-water-sublayer on the heated wall and steam blankets over it. The CHF correlation proposed could correctly predict the existing experimental data for circular tubes of 0.33-4 mm in diameter with mass flux of 124-90000 kg (m^2 s)^-1 and inlet water subcooling of 35-210 K. at 0.1-7.1 MPa, resulting in CHF of 4.2-224 MWm^-2, and for rectangular channels of 3 20 mm gap with a mass flux of 940-27 000 kg(m^2s)^-1 and inlet water subcooling of 13-166 K at 0.1-3.0 MPa, resulting in CHF of 2.0-62 MW m^2. An error of the CHF correlation has also been estimated. © 1999 Elsevier Science S.A. All rights reserved.