Burnout and distribution of liquid in evaporative channels of various lengths

Abstract This paper presents the results of experimental investigations on the distribution of liquid in annular dispersed steam-water upflow in 0.15 and 1.0 m long vertical heated tubes. The effect of heat flux and flow parameters on the distribution of the liquid between the core and the wall liquid film at the end of the heated section and at six points on the 1 m length downstream was investigated. Critical heat flux, liquid film flow rate at burnout and at the onset of annular dispersed flow with subcooled water fed to the heated channel inlet was measured. The rate of total liquid film entrainment relative to the heating is presented.