THE EFFECT OF THE MARANGONI FLOW ON THE FILM CONDENSATION

The objective of this paper is to quantify the effect of Marangoni flow on the vapor film condensation and analyzed the effect of the gravity, the shearing force at the gas-liquid interface and the Marangoni strength caused by the surface tension on the Nusselt number. The results show that the effect of the gravity is very clear to the thickness of the film. Marangoni effect can not be ignored at zero gravity condition. The effect of the vapor Reynolds number (Rev0) at the zero-gravity conditions on the film is bigger than that at the gravity conditions. The average ratio of the film thickness ((delta) over bar) is 6.5% at the gravity conditions and 21.5% at zero-gravity conditions when the Re(v0) changes from 8000 to 15000.