Laminar forced convection condensation of saturated vapors in the near-critical region

A numerical analysis is presented for laminar forced convection condensation of saturated vapors of water and carbon dioxide on a fiat surface in the reduced temperature range T-s/T-c = 0.990-0.999. The heat transfer coefficient in the region T-s/T-c < 0.998 can be correlated by using Fujii and Uehara's equation when the representative physical properties are evaluated at the film temperature. The reduction of the condensation mass flux or the heat flux at the vapor-liquid interface due to the convection term in the condensate film is expressed as a function of the phase change number with the average isobaric specific heat.