Please note a common SIMM/Gulliver seminar of Prof. Satish Kumar from the University of Minnesota on Tuesday the 8th of April (unusual slot) at 11am in Charpak room.
Satish Kumar Department of Chemical Engineering and Materials Science, University of Minnesota
Droplet dynamics near topographical features.
While solid substrates are often idealized as being perfectly smooth, all real surfaces possess some level of topographical and chemical heterogeneity. This heterogeneity can greatly influence droplet dynamics, and is of tremendous relevance for applications ranging from oil recovery to water harvesting to advanced manufacturing. In this talk, we will show how mathematical models based on lubrication theory that account for surface topography provide insight into how topographical features induce pinning of the three-phase contact line where the liquid, air, and solid all meet. Sufficiently strong external forces cause contact-line depinning, and in some cases the depinning force can be
understood through relatively simple scaling relationships. Three examples will be presented
involving (i) shear-induced depinning, (ii) gravity-induced depinning, and (iii) evaporation-induced depinning. Comparisons to existing experimental observations will be discussed.
- This évènement has passed.