[en] The technique for calculaiton of mass vapor content and factors of heat transfer in the post-dryout region on disperse flowing in a round tube with an arbitrary distribution of heat flow along the length is described. The technique does not put restrictions on the range of vapor contents and in the limit it ensures continuous transition to the one-phase convection. The calculation results are compared with the experimental data for electric heating (uniform and cosine heating) and heating by liquid metal. It is shown that utiljzation of an empirical constant alone permits to obtain satisfactory agreement of the calculation and experimental values in a wide range of the regime parameters