https://doi.org/10.1140/epjst/e2013-01781-7
Regular Article
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
a e-mail: h.kuhlmann@tuwien.ac.at
Received:
1
July
2012
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
