Pool boiling heat transfer in monoethyleneglycol aqueous solutions

• Addition of MEG to water increases the bubble frequency.
• Addition of MEG to water increases the bubble diameter.
• Addition of MEG to water increases the bubble nucleation site density.
• Addition of MEG to water enhances the boiling heat transfer coefficient.

Significant interest in formulation of pool boiling heat transfer in liquid mixtures can be found in the literature. In this article, it is aimed to validate the existing models and correlations specifically for boiling of water/monoethyleneglycol binary solution. In this investigation, boiling heat transfer coefficient, bubble departing diameter, bubble departing frequency and nucleation site density have been experimentally investigated in various concentrations and heat fluxes. The experimental data obtained in this investigation shows that the boiling heat transfer coefficients of the case study are much higher than the predicted values by major existing correlations and models. Furthermore, it is shown that the boiling heat transfer coefficient in mixtures of water/monoethyleneglycol is even higher than the ideal boiling heat transfer coefficient; i.e. inclusion of monoethyleneglycol in water significantly enhances the boiling heat transfer coefficient. We hypothesize that the enhancement in boiling heat transfer coefficient is related to bubble dynamics, which is not directly included in the existing models and correlation. A model is then proposed to predict the boiling heat transfer coefficient in water/monoethyleneglycol solution. Proposed formulation presents significantly improved performance compared to studied methods.