Analytical study of heat transfer in the post dry-out region in smooth and rough vaporization channels

An analytical model is suggested for calculation of heat transfer in a post dry-out region, which is based on the asymptotic turbulent boundary layer theory. High efficiency of artificial roughness in the enhancement of heat transfer under the conditions of a two-phase dispersed flow is shown. Treatment of a part of the experimental data obtained by the present authors and of some of the reported data in conformity with the suggested model of heat transfer in the post dry-out region has given a satisfactory agreement between the experiment and prediction. (author)