Critical Heat Flux in Vertical Steam-Generating Channels in the Absence of Circulation of Heat-Transfer Agent: Critical Power of Channels of Different Shapes

An experimental investigation is performed of the critical heat flux in vertical channels in the absence of circulation of heat-transfer agent through the lower cross section. Experiments are performed in tubes 30, 40, and 80 mm in diameter, as well as in 19- and 40-rod assemblies. Equations are suggested for the calculation of critical power, which are valid in a wide range of the geometric and process parameters, including at a low pressure.