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DTSTAMP:20260523T215526Z
SUMMARY:Dr Clarissa Schönecker (Max Planck Institute): Slippage at microst
 ructured surfaces
DESCRIPTION:Micro- or nanostructured surfaces can provide a significant sli
 p to a fluid flowing over the surface\, making them attractive for the dev
 elopment of functional coatings. This slip is due to a second fluid being 
 entrapped in the indentations of the structured surface\, like air for sup
 erhydrophobic surfaces or oil for so-called lubricant-infused surfaces (SL
 IPS). This talk addresses the flow phenomena close to such surfaces. An an
 alytical model is presented that describes the flow field as well as the e
 ffective slip length for flow over a surface with rectangular grooves. The
  model captures arbitrary geometries of the grooves as well as a Newtonian
  fluid of arbitrary viscosity being entrapped in the grooves. It can for e
 xample be employed as a guideline to design efficient surface coatings for
  drag reduction. Additionally\, corresponding experiments on the flow fiel
 d and local slip length close to a superhydrophobic surface are presented.
  While the global behavior of flow past superhydrophobic surfaces has been
  widely investigated\, the local flow phenomena have not yet been observed
  experimentally. Using fluorescence correlation spectroscopy\, we performe
 d detailed measurements of the flow in close vicinity to the surface. We e
 xplain the distribution of the local slip length by the local hydrodynamic
 s within the air layer and at the air-water interface and show that slippa
 ge can be significantly influenced by the presence of surface-active subst
 ances adhering to the air-water interface.
URL:https://www.imperial.ac.uk/events/102976/dr-clarissa-schonecker-max-pla
 nck-institute-slippage-at-microstructured-surfaces/
DTSTART;TZID=Europe/London:20160226T160000
DTEND;TZID=Europe/London:20160226T170000
LOCATION:United Kingdom
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