Simulation of boiling in a dilute emulsion

The numerical model of boiling dilute emulsions developed in Chap. 4 is applied to two-dimensional simulations of pool boiling on a heated wire. Single-component simulations show good agreement with experimental results, but the model as formulated does not lead to any significant improvement in heat transfer due to boiling emulsions. At low droplet volume fraction, the rate of boiling is very low and has little effect on heat transfer. At higher droplet fraction droplets boil near the outside of the thermal boundary layer where they do not provide much benefit to heat transfer, while the large volume of bubbles created can act as insulation of the wire. Increasing the droplet-bubble collision efficiency and introducing an empirical factor multiplying the pseudo-turbulent effects can lead to higher predicted heat transfer coefficients, but the results depend strongly on droplet volume fraction.