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.
Monday, March 26, 2018 - 9:00am - 9:30am
Jens Eggers (University of Bristol)
We study air entrainment by a solid plate plunging into a viscous liquid, theoretically and numerically. At dimensionless speeds Ca = Uη/γ of order unity, a near-cusp forms due to the contact line. The radius of curvature of the cusp’s tip scales by the slip length multiplied by an exponential of -Ca. The pressure from the air flow drawn inside the cusp leads to a bifurcation, at which air is entrained, i.e. there is ‘wetting failure’.
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