Critical heat flux at high velocity channel flow with high subcooling

A quantitative analysis of critical heat flux (CHF) in heated channels unde r high mass flux with high subcooling was successfully carried out by apply ing a new flow model to the existing CHF model of a macro-water-sublayer on the heated wall and steam blankets over it. The CHF correlation proposed c ould correctly predict the existing experimental data for circular tubes of 0.33-4 mm in diameter with mass flux of 124-90 000 kg (m(2) s)(-1) and inl et water subcooling of 35-210 K at 0.1-7.1 MPa, resulting in CHF of 4.2-224 MW m(-2), and for rectangular channels of 3-20 mm gap with a mass flux of 940-27 000 kg (m(2) s)(-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. (C) 1999 Elsevier Science S.A. All rights reserve d.