Wall and aerosol condensation during cooled laminar tube flows

Abstract

The equations for heat and mass transfer in laminar flow are presented and their solutions are considered in the limit of low vapor density and constant thermodynamic properties. Simple ways of determining the maximum and minimum possible wall condensation are discussed. Numerical calculations between these limits are performed by orthogonal collocation. For dibutyl phthalate vapor in air, latent heat release is negligible and most of the vapor condenses das aerosol. New results are presented for water vapor, including the effects of latent heat. Water aerosol growth is inhibited due to latent heat release and most of the vapor condenses on the wall. Also, water droplets near the tube axis may evaporate, due to the large diffusion rate of water molecules to the wall.