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Regensburg 2013 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 27: Fluid Dynamics and Turbulence

DY 27.7: Talk

Thursday, March 14, 2013, 11:15–11:30, H48

Thermal convection in thin soap filmsMarkus Abel1,2, Luca Biferale3,4, •Henning Krüsemann5, and Mauro Sbragaglia3,41LEMTA UdL, Nancy, France — 2Ambrosys GmbH, Potsdam, Germany — 3University of Rome, Tor Vergata, Italy — 4INFN, Rome, Italy — 5University of Potsdam, Germany

In recently published experiments it was shown that turbulent convection in a vertically suspended foam film with a nanometer thickness speeds up thinning enormously. The effects that govern the resulting turbulent flows have not been described theoretically, so far. At the nanoscale,mesoscopic and microscopic forces start to play a role, which are unimportant for thicker films.

The presented work concerns a theory for the dynamics of a vertically oriented foam film, including external forcing, in particular thermal effects. The aim is to describe convection in vertical foam films. A closed two-dimensional model for the fluid flow is derived, considering capillary effects, as well as van-der-Waals interaction between the amphiphile surfactants and other forces.

The resulting equations are simulated using a Lattice Boltzmann scheme, which was specially developed for this case. An outline of the development of this model is given and some results considering the analysis of the flow are presented.

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