Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 38: Micro and Nanofluidics II

CPP 38.5: Talk

Thursday, March 25, 2010, 10:30–10:45, H39

Lattice Boltzmann simulations of a sphere approaching a superhydrophobic surface — •Christian Kunert¹ and Jens Harting² — ¹Institut für Computerphysik, Pfaffenwaldring 27, 70569 Stuttgart — ²Dept. of Applied Physics, TU Eindhoven, Postbus 513, NL-5600MB Eindhove

When an object that is submerged in a liquid is approached towards a surface, the lubrication force raises. The measurement of the lubrication force allows to study the flow profile near objects and thus to deduce the flow boundary condition. In particular, such a measurement can be used to study the effect of boundary slippage. The slip on a surface can be increased by combining roughness and hydrophobic interactions. On such surfaces, vapor or gas might be trapped between the roughness asperities creating a so-called superhydrophobic surface. In this contribution we present lattice Boltzmann simulations of a sphere that approaches a superhydrophobic surface generated by bubbles that are trapped in holes on the surface.