On the different manifestations of particle accumulation structures (PAS) in thermocapillary flows
Vienna University of Technology, Institute of Fluid Mechanics and Heat Transfer, Resselgasse 3, 1040 Vienna, Austria
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Revised: 18 January 2013
Published online: 19 March 2013
Particle de-mixing in flows in liquid-bridges driven by the Marangoni effect is investigated using primarily analytical models of the flow. The mechanism of particle–free-surface collisions is shown to explain the formation of experimentally observed particle depletion zones. This mechanism causes a mapping (or transfer) of particles moving on certain streamlines to other streamlines resulting in creation of a distinct depletion zone. Moreover, we demonstrate line-like particle accumulation along a chaotic streamline corresponding to SL2-PAS which is closed by a trajectory segment which is created by particle–free-surface interaction. The resulting limit cycle is stable due to the combined properties of the bulk transport and gathering at the free surface.
© EDP Sciences, Springer-Verlag, 2013