Critical heat flux in vertical steam-generating channels in the absence ofcirculation of heat-transfer agent: Critical power of channels of different shapes

An experimental investigation is performed or the critical heat flux in ver tical 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 sug gested for the calculation of critical power, which are valid in a wide ran ge of the geometric and process parameters, including at a low pressure.