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SUMMARY:Impact of supercooled droplets on nanoengineered surfaces - Manish
  Tiwari (University College London)
DTSTART:20171006T084500Z
DTEND:20171006T093000Z
UID:TALK84401@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Ice formation is commonplace in nature and manmade application
 s and it also influences our lives positively and sometimes catastrophical
 ly. However\, a clear understanding of ice formation\, role of substrate/s
 urface on which it forms are subjects of very vigorous&nbsp\; current rese
 arch. Icing in dynamic conditions\, such as freezing of a cold drop upon h
 itting a surface or freezing in the presence of airflow are even less unde
 rstood\, despite a few novel insights developed in the last five years. Th
 is presentation will start by summarising some open and closed questions o
 n ice formation on surfaces using nucleation theory and its extensions and
  report on a number of experiments to this end\, which use droplet/substra
 te system as a model. To this end we will discuss the role of surface nano
 engineering and wettability control in controlling the ice nucleation. Ins
 ights into design of icephobic surfaces with exceptional ability to delay 
 ice formation will also be shared. The role of environmental variables suc
 h as humidity an air flow will also be discussed. Next\, for the majority 
 of the presentation\, we will consider the dynamic problem of droplet and 
 jet impacting on such surfaces reaching speeds up to ~30 m/s and Weber num
 bers >10\,000. Droplet supercooling and its effect on droplet impact dynam
 ics will be analysed in detail. In addition\, surface morphology needs and
  our initial results on surface durability testing will also be presented.
LOCATION:Seminar Room 1\, Newton Institute
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