Student Seminar

Rapid Droplet Detachment via Pancake Bouncing

Friday, 20 October 2017 12:00PM PDT
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Student Seminar
 
Meldon Deglint
Dept of Physics, SFU
 
Rapid Droplet Detachment via Pancake Bouncing
 
Oct 20, 2017 at 12PM
 

Synopsis

Minimizing the contact time of droplets has many important applications such as anit-icing and self-cleaning. Liu et al. were able to show that water dropped on a superhydrophobic surface made of submillimeter-scale posts coated in nanotextures deforms into a pancake shape and leaves the surface while still in this shape. This is different to an convectional bounce where the drop would regain a spherical shape before leaving the surface. When measuring the total contact time of the water, the pancake bounces had a fourfold reduction in contact time when comparted to a convectional bounce. Finally, by tapering the posts coated in nanotextures Liu et al. found that posts begin to behave like harmonic springs and the pancake bouncing was exhibited for a wide range of impact velocities.