Film condensation in a large diameter tube with upward steam flow

Film condensation was considered for upward steam flow at the atmospheric pressure. The experimental data were obtained inside a vertical duralumin tube with the internal diameter of 200 mm and roughness height of 0.14 mm. The film Reynolds numbers and vapor Reynolds numbers were varied within the range of 1-16 and 280-3460, respectively. The obtained experimental data were lower than classical Nusselt prediction. The suggested correlation for the Nusselt number agrees the most of the data within 20%.