Thermocapillary Flow on Superhydrophobic Surfaces

Details Thermocapillary Flow on Superhydrophobic Surfaces Thermocapillary Flow on Superhydrophobic Surfaces

2010-03-22

arxiv.org/abs/1003.4161v1

Phys. Rev. E 82, 037301 (2010)

Physics

Fluid Dynamics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevE.82.037301

A liquid in Cassie-Baxter state above a structured superhydrophobic surface is ideally suited for surface driven transport due to its large free surface fraction in close contact to a solid. We investigate thermal Marangoni flow over a superhydrophobic array of fins oriented parallel or perpendicular to an applied temperature gradient. In the Stokes limit we derive an analytical expression for the bulk flow velocity above the surface and compare it with numerical solutions of the Navier-Stokes equation. Even for moderate temperature gradients comparatively large flow velocities are induced, suggesting to utilize this principle for microfluidic pumping.

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