Models for Droplet Motion on Hydrophilic and Hydrophobic Surfaces

Abstract

Water droplet flows on surfaces have been numerically investigated using a new hybrid dynamic contact angle approach and four others, which include Kistler, Yokoi, Cox and OpenFOAM models, and the computations are compared with the experimental data. Two surface types, hydrophobic and hydrophilic are used to show the influence of surface wettability. Results put in evidence that the motion of droplets is very dependent on the formulation of the dynamic contact angle in relation to the wettability of surfaces. On the hydrophobic surface, the Yokoi and Cox models deviate significantly from the experimental data, whereas hybrid (proposed model) can be described as the most successful model. On the hydrophilic surface, the hybrid model imitates droplet dynamics very successfully, but the Yokoi model shows the best agreement with the experiments. It is clearly seen that the hybrid model can be accepted as one of the most successful models in multi-phase flow simulations with three-phase points.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Notes on contributors

Mustafa Sengul

Mustafa Sengul obtained his BSc (2019) from the Mechanical Engineering Department at Istanbul Technical University. He is now a PhD student in the Aerospace Engineering at Istanbul Technical University.

Esra H. Isik

Esra H. Isik obtained her BSc (2019) from the Mechanical Engineering Department at Istanbul Technical University. She is currently an MSc student in the Aerospace Engineering at Istanbul Technical University.

I. Bedii Ozdemir

I. Bedii Ozdemir received his BSc (1985) from Bogazici University and MSc from Tennessee Technological University (1987), all in Mechanical Engineering. He obtained his postgraduate Diploma (1988) from the Environmental and Applied Fluid Mechanics Department of von Karman Institute and a PhD (1992) in Mechanical Engineering from Imperial College, London. He is currently a professor at the Faculty of Mechanical Engineering at Istanbul Technical University and is the Head of the Fluids Group.