An experimental investigation on forced convection condensation of steam with air in a horizontal tube was presented. Based on the results of flow regime prediction

influences of air mass fraction

velocity and pressure of the mixture gases and inner wall sub-cooling on local condensation heat transfer were analyzed. According to the experiment results

local heat transfer coefficient always decreased with the increase of air mass fraction and increased with the increase of total mixture gases pressure. For annual flow

the local heat transfer coefficient was affected by the mixture velocity

and for wavy flow

the ability of local heat transfer was influenced greatly by the air mass fraction and development of wavy flow

while for stratified flow

the effect of wall sub-cooling on heat transfer was dominated.