| Abstract: | A theoretical study is presented of the evaporation of binary mixtures in upward annular flow. Heat and mass balances are written and the resulting equations solved to give axial and radial variations of concentrations, temperatures and flowrates of ethanol-water mixtures. Mass and heat transfer within the film are calculated by an extension of the Dukler-Hewitt method for heat transfer in single-component films. It is concluded from the worked examples that, for the mixture considered, the film flowrates and wall temperatures are not significantly controlled by mass transfer in either phase and can be calculated by flash vaporization methods. |
