Regensburg 2013 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 27: Fluid Dynamics and Turbulence
DY 27.7: Vortrag
Donnerstag, 14. März 2013, 11:15–11:30, H48
Thermal convection in thin soap films — Markus Abel1,2, Luca Biferale3,4, •Henning Krüsemann5, and Mauro Sbragaglia3,4 — 1LEMTA 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.