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This work provides essential insight on the evaporation process of the thin film in an extended evaporating meniscus through a comprehensive theoretical model that incorporates the effect of nanofluid and the electrostatic interactions arising due to the nanoparticles ( Al 2 O 3) with polar liquid ( water ). A lubrication theory-based model comprised of the Young-Laplace equation and kinetic-theory-based mass transport equations have been employed to reveal the different facets and the characteristics of the evaporating thin film meniscus. Results obtained show the comparison of the base liquid and the nanofluid first with the dispersion interactions alone and then with electrostatic interactions. It is revealed that the introduction of the nanoparticles in the thin film evaporation can increase the heat transfer; however, for polar liquids, the electrostatic interactions can increase the total disjoining pressure and reduce the capillary pressure for a given pressure difference. Also, neglecting the electrostatic interactions with enhanced thermophysical properties and dispersion interactions alone can exaggerate the thickness increment and understate the heat transfer from the evaporating nanofluid meniscus. Moreover, incorporating the electrostatic interactions cannot be overlooked while unveiling the underlying physics of the evaporating nanofluid meniscus for polar liquid.

Effect of Nanofluid and Electrostatic Disjoining Pressure on Heat Transfer from an Evaporating Meniscus