Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 47: Complex Fluids and Soft Matter (joint session DY/CPP)

CPP 47.4: Vortrag

Mittwoch, 3. April 2019, 16:00–16:15, H3

Marangoni flow in thin freely suspended liquid films — •Torsten Trittel¹, Christoph Klopp¹, Kirsten Harth², Alexey Eremin¹, and Ralf Stannarius¹ — ¹Institute for Physics, Otto von Guericke University, 39106 Magdeburg — ²Physics of Fluids and Max Planck Center for Complex Fluid Dynamics, P.O. Box 217, 7500 AE Enschede

Next to their great success in display applications, liquid crystals are enormously attractive in the field of fundamental physics. Free-standing films with unique aspect ratios can serve as an ideal system for the investigation of two-dimensional hydrodynamics. We focus on thermocapillary effects in such films under microgravity. We present results of two suborbital rocket flights and show that thermal gradients within the film plane can cause thermocapillary (Marangoni) effects. The temperature dependence of the surface tension σ(T) can induce flow from the hot to the cold film edge. Finally we developed a hydrodynamic model that can describe the experimental observations quantitatively. In contrast to Benard-Marangoni or Rayleigh-Benard convection, the relevant control parameter is the temperature difference, not the temperature gradient across the film.

The study was supported by the German Aerospace Center (DLR) within projects 50WM1430 and 50WM1744.