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    Prediction of Contact Angle of Nanofluids by Single-Phase Approaches

    Year: 2019

    Journal: Energies, Volume 12, DEC

    Authors: Cobanoglu, Nur; Karadeniz, Ziya Haktan; Estelle, Patrice; Martinez-Cuenca, Raul; Buschmann, Matthias H.

    Organizations: EU COST ActionEuropean Cooperation in Science and Technology (COST)European Commission [CA15119]; European Union through the European Regional Development Fund (ERDF); Ministry of Higher Education and ResearchMinistry of Higher Education & Scientific Research (MHESR); French region of Brittany and Rennes Metropole

    Keywords: contact angle; nanofluid; Bond number

    Wettability is the ability of the liquid to contact with the solid surface at the surrounding fluid and its degree is defined by contact angle (CA), which is calculated with balance between adhesive and cohesive forces on droplet surface. Thermophysical properties of the droplet, the forces acting on the droplet, atmosphere surrounding the droplet and the substrate surface are the main parameters affecting on CA. With nanofluids (NF), nanoparticle concentration and size and shape can modify the contact angle and thus wettability. This study investigates the validity of single-phase CA correlations for several nanofluids with different types of nanoparticles dispersed in water. Geometrical parameters of sessile droplet (height of the droplet, wetting radius and radius of curvature at the apex) are used in the tested correlations, which are based on force balance acting on the droplet surface, energy balance, spherical dome approach and empirical expression, respectively. It is shown that single-phase models can be expressed in terms of Bond number, the non-dimensional droplet volume and two geometrical similarity simplexes. It is demonstrated that they can be used successfully to predict CA of dilute nanofluids' at ambient conditions. Besides evaluation of CA, droplet shape is also well predicted for all nanofluid samples with +/- 5% error.
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