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Seminars
Contact :
Hèléne Berthoumieux
Tel : +33 (0) 1 40 79 xx xx
Paddy Royall
Tel : +33 (0) 1 40 79 xx xx
Gulliver seminars take place on Mondays at 11:30 AM in the F304 room, and typically last one hour including questions. The seminars are in English, and the scientific topics are mainly those studied in the laboratory.
SEMINAIRE SIMM - Satish Kumar (University of Minnesota)
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.
Satish Kumar (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.
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The audience is often heterogeneous - because of the wide range of scientific topics covered in the lab - so planning a talk for a broader audience would be preferred. The seminar is in English, and speakers are thus invited to prepare their slides in English.
The seminar starts at 11:30 AM. The speaker is asked to arrive in the lab at least 15 minutes in advance to set up their computer. The talks last typically 45 minutes, and are followed by a discussion time.