ELFT HÍRADÓ

[StatFizSzeminar <statfiz AT glu.elte.hu>]

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                   ELTE Institute of Physics
                SEMINARS IN STATISTICAL PHYSICS


                      Extraordinary time!


                       19th August 2016
                        Friday, 11 a.m.
                          Room 2.54

                        Rodica Borcia

      Department of Statistical Physics and Nonlinear Dynamics, 
       Brandenburg University of Technology, Cottbus, Germany

               "Dancing Drops Over Vibrating Substrates"


We study the motion of a liquid drop on a solid plate simultaneously 
submitted to horizontal and vertical harmonic vibrations. The investigation 
is done via a phase field model earlier developed for describing static and 
dynamic contact angles. The density field is nearly constant in every bulk 
region and varies continuously from one phase to the other with a rapid but 
smooth variation across the interfaces. Complicated explicit boundary 
conditions along the interface are avoided and captured implicitly by phase 
field terms in the hydrodynamic basic equations. The contact angle is 
controlled through the density at the solid substrate, a free parameter 
varying between 0 and 1 [R. Borcia, I.D. Borcia, M. Bestehorn, Phys. Rev. E 
78, 066307 (2008)]. We emphasize the swaying and the spreading modes, 
earlier theoretically identified by Benilov et al. via a shallow-water 
model for drops climbing uphill along an inclined plane oscillating 
vertically [J. Fluid Mech. 674, 93 (2011)]. The numerical phase field 
simulations will be completed by experiments. Some ways to prevent the 
release of the dancing drops along a hydrophobic surface into the gas 
atmosphere are also discussed in this paper.



     1117 Budapest, Pázmány P. sétány 1/A (Northern Block)
              home page: http://glu.elte.hu/~statfiz


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