A model for forced convective boiling of ternary mixtures

This paper presents an extension to ternary mixtures of a methodology proposed for prediction of forced convective boiling of binary mixtures in upwards annular flow (1). Interphase heat and mass transfer are dealt with using an effective diffusivity film method. Droplet entrainment and deposition are modelled via a droplet interchange model that takes into account the local non-equilibrium between the liquid film and the entrained droplets. Results are compared with those obtained experimentally by Kandlbinder (2) for n-pentane/n-hexane/iso-octane mixtures. As for the binary case, it is claimed that the deterioration in the heat transfer coefficient is due to a combined effect of droplet interchange and mass transfer resistance in the vapour side.