An improved model based on real gas state equation and fog formation for condensation heat and mass transfer

Abstract

In order to predict the condensation heat transfer coefficient precisely, this work aimed at proposing a generalized model with a wide scope of parameters applicability, namely, we presented an improved model that can predict the condensation characteristics which based on heat and mass transfer analogy with consideration of gas compressibility factor, fog formation factor, film waviness factor, suction factor and eddy diffusion factor. The improved model is suitable for those conditions: low pressure condensation at plate-shape and curved-shape surface with natural/forced convection, high pressure condensation at curved shape surface with natural convection. The improved model shows good applicability with the scope of the pressure is up to 2 MPa and the non-condensable (NC) gas mass fraction up to 90%. Six experimental databases (including 436 data) were chosen to validate this model. More than 97% of the results predicted by the improved model were within ±30% bands.