FILM CONDENSATION HEAT-TRANSFER ON A VERTICAL POROUS-LAYER COATED PLATE

Film condensation on a vertical porous coated plate is investigated nu merically for a porous/fluid composite system based on the dispersion effect in the porous coating. The mathematical model improves the conv entional matching conditions by considering the stress force at the po rous coating interface. The numerical results show the effects of the porous coating thickness, the effective thermal conductivity and the p ermeability on condensate film thickness and local Nusselt number. The predicted average Nusselt number has similar tendencies to experiment al results reported in literature, such that using a thin porous coati ng would be a viable alternative for enhancing the condensation heat t ransfer.