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DTSTART:20230326T030000
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DTSTAMP:20260424T102126Z
UID:63bd45f759f16341243674@ist.ac.at
DTSTART:20230413T110000
DTEND:20230413T120000
DESCRIPTION:Speaker: John Kolinski\nhosted by Scott Waitukaitis\nAbstract: 
 Before an object can contact a surface during impact\, it must drain the a
 ir beneath it. For droplet impacts and soft solids\, the air will fail to 
 drain\, and instead compress. Due to the low viscosity of the air\, the im
 pact process takes place over fleeting timescales and diminutive length-sc
 ales\, and is typically obscured by the impacting body\, making direct obs
 ervation difficult or impossible. Here we us a combination of the Virtual 
 Frame Technique and Frustrated Total Internal Reflection that enables the 
 direct visualization of contact formation and front propagation during imp
 act. We find that the physical properties of the fluid or material involve
 d in the impact process\, including the capillary velocity in fluid drople
 ts and the Rayleigh velocity in elastomer impact\, play a crucial role in 
 the impact process - both the droplet and the elastomer skate on a nanomet
 er-scale film of air during the highest velocity impacts\, but only the el
 astomer demonstrates a transition from elasticity- to inertially-dominated
  impact regimes. Contact front and air film instability will be discussed 
 for both liquid droplets and soft elastic hemispheres.
LOCATION:Big Seminar Room B (big) I23.EG /63 seats (I23.EG.102)\, ISTA
ORGANIZER:cpetz@ist.ac.at
SUMMARY:John Kolinski: Air mediation of compliant impact on smooth solid su
 rfaces
URL:https://talks-calendar.ista.ac.at/events/4099
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