Heat transfer at nucleate boiling of non-azeotropic mixtures

At present, there is no sufficiently reliable and physically proved method for calculating the heat exchange coefficient in boiling of non-azeotropic mixtures. The main cause is complexity of the mechanism of boiling since non-azeotropic mixtures have the temperature glide (i.e. non-isothermal phase transition). The experimental results at boiling of non-azeotropic mixtures in horizontal smooth steel and copper pipes have been selected for the theoretical analysis. The experimental data for the nucleate boiling were compared to calculations on various theoretical dependences. The calculated heat transfer coefficient is proposed by Gogonin's dependence (2006). The mentioned dependence taking into account the influence of physical properties of a wall and its roughness on a heat exchange coefficient, results in the best coincidence to experimental data.