contact lines

Tuesday, March 27, 2018 - 1:30pm - 2:00pm
Lou Kondic (New Jersey Institute of Technology)
We discuss instabilities of fluid films of nanoscale thickness,
with a particular focus on films where the destabilizing mechanism
allows for linear instability, metastability, and absolute stability,
depending on the mean film thickness. Our study is motivated by nematic
liquid crystal films; however similar instability mechanisms, and forms
of the effective disjoining pressure, appear in other contexts, such as
the well- studied problem of polymeric films on two-layered substrates.
Tuesday, March 27, 2018 - 11:30am - 12:00pm
Vladimir Ajaev (Southern Methodist University)
Studies of sessile droplets provide a natural framework for modeling dynamic contact lines. We present several recent results on droplet behavior on heated substrates under the conditions when the effects of both wetting and evaporation are important. For liquids which are aqueous solutions, we investigate how the formation of electrical double layers near the interfaces affects droplet spreading and evaporation. Apparent contact angle is found as a function of both heating and ion concentration in the liquid.
Monday, March 26, 2018 - 9:40am - 10:10am
Serafim Kalliadasis (Imperial College London)
The moving contact line problem occurs when modelling one fluid replacing another as it moves along a solid surface, a situation widespread throughout industry and nature. Classically, the no-slip boundary condition at the solid substrate, a zero-thickness interface between the fluids, and motion at the three-phase contact line are incompatible - leading to the well-known shear-stress singularity.
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