Marangoni convection in droplets on superhydrophobic surfaces

By Daniel Tam, Volkmar von Arnim, G. H. McKinley, Anette E. Hosoi. Journal of Fluid Mechanics, 2009

156 citations recorded by the source corpus.

We consider a small droplet of water sitting on top of a heated superhydrophobic surface. A toroidal convection pattern develops in which fluid is observed to rise along the surface of the spherical droplet and to accelerate downwards in the interior towards the liquid/solid contact point. The internal dynamics arise due to the presence of a vertical temperature gradient; this leads to a gradient in surface tension which in turn drives fluid away from the contact point along the interface. We develop a solution to this thermocapillary-driven Marangoni flow analytically in terms of streamfunctions. Quantitative comparisons between analytical and experimental results, as well as effective heat transfer coefficients, are presented.

Subfields: Computational Mechanics, Surfaces, Coatings and Films

View Paper: https://www.semanticscholar.org/paper/d35d6900f41f4f597e2de2c24fa7b58538b1946b

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In Computational Mechanics

1. Evelyn Wang
2. Ryan Enright
3. Nenad Miljkovic
4. Yangying Zhu
5. Jeremy Cho

In Surfaces, Coatings and Films

1. Ryan Enright
2. Nenad Miljkovic
3. Evelyn Wang
4. Yangying Zhu
5. Jeremy Cho

Citations in the corpus

• Modeling and Optimization of Superhydrophobic Condensation (2013, background): “Internal droplet convection was neglected in the model since the droplets were sufficiently small so that conduction is the primary mode of heat transfer through the droplet [27, 40].”