Turbulent mixed convection heat and mass transfer in a wetted channel

The effects of combined buoyancy forces of thermal and mass diffusion on the turbulent forced convection heat and mass transfer in the upward and downward flows were numerically examined in detail. Results are presented for air-water system under different wall temperature and Reynolds number. Particular attention is paid to investigating the role of latent heat transport associated with the film vaporization in turbulent mixed convection heat and mass transfer. Predicted results show that the heat transfer along the wetted wall is dominated by the latent heat transfer. Besides, the buoyancy forces would cause a deterioration of the heat and mass transfer coefficients in the buoyancy-aiding flow compared with the corresponding results of turbulent forced convection, and vice versa in the opposing flow.