The effect of frontal velocity on heat transfer characteristics of two-row staggered flat fin-and-tube heat exchanger in wet condition was studied experimentally.The latent heat transfer firstly increased with increasing frontal velocity

then it seemed that there was no relationship between them when frontal velocity exceeded 1.27 m·s-1.The wet sensible heat transfer coefficients were slightly higher than those in dry condition.Based on the results of experiment

a “surface reaction” concept was introduced to simulate the phenomenon of heat and mass transfer during the process of vapor condensation on the cold surface

then a simplified three-dimensional numerical model was presented.The humid air temperature and vapor distribution were obtained

and then the effect of frontal velocity on heat and mass transfer was analyzed with the field synergy principle.Finally

the numerical simulation results agreed well with experimental data.