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SUMMARY:Engineering interfacial flows and instabilities in solidifying liq
 uids - Pierre-Thomas Brun\, Chemical and Biological Engineering\, Princeto
 n University
DTSTART:20220204T160000Z
DTEND:20220204T170000Z
UID:TALK169472@talks.cam.ac.uk
CONTACT:Prof. Jerome Neufeld
DESCRIPTION:This talk is concerned with interfacial fluid mechanics in the
  context of solidifying liquids. Due to favorable downscaling with length\
 , capillary effects are dominant for submillimetric objects and play a key
  role is a number of engineering and natural processes where they dictate 
 the shape of drops\, thin films\, and coatings. As such\, interfacial effe
 cts have been widely researched\, albeit primarily in Newtonian fluids or 
 in fluids whose constitutive law remains constant over time. In particular
 \, the subtle interplay between hydrodynamics\, solidification and the sol
 id structures formed when harnessing capillary effects remain poorly under
 stood. We will attempt to fill this gap of knowledge and study the physics
  of viscous jets and sheets in solidifying liquids. We will discuss experi
 ments conducted with a model system\, an elastomeric solution\, so as to e
 lucidate the competing phenomena at play in the formation of patterns and 
 structures arising from interfacial flows and their subsequent or concomit
 ant solidification. We will revisit classic fluid mechanics models\, e.g. 
 lubrication\, and adapt them to situations where the flow is arrested in f
 inite time. First\, we will discuss droplet forming instabilities and show
  that the patterns they form can be engineered via the use of templates. N
 ew phenomena\, e.g. self-templating\, will be explored too. Second\, we wi
 ll revisit classic coating\, drainage and imbibition problems and demonstr
 ate that these flows can be used for materials design\, e.g. fabricate sof
 t robots. In fact\, curing converts the flows we study into elastic solids
 \, introducing the concept of “building with flows”.\n\nhttps://www.ca
 mbridge.org/core/journals/journal-of-fluid-mechanics/fluid-mechanics-webin
 ar-series
LOCATION:Fluid Mechanics Webinar Series
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