Critical heat flux during saturated liquid boiling

Based on the dry spot model, conditions for heat transfer crisis occurance directly on the exothermic surface along three medium boundary: liquid - vapour wall under Newtonian liquid bubble boiling, are considered. Ratio for critical heat flux, which is unique both for boiling in a large volume under natural convection conditions and for the forced flow of boiling liquid and which does not comprise any empirical values is analytically produced. Explanation of the observed spread in experimental data for critical heat flux is given. Comparison of the resuls obtained to experimental data for the tubes is conducted