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DTSTART:20170326T030000
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DTSTART:20161030T020000
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DTSTAMP:20260428T111130Z
UID:589b231c5491c794186162@ist.ac.at
DTSTART:20170314T130000
DTEND:20170314T140000
DESCRIPTION:Speaker: Patrice Le Gal\nhosted by Björn Hof\nAbstract: Fiber 
 networks encompass a wide range of natural and man-made materials. The thr
 eads or fi \nlaments from which they are formed\nspan a wide range of leng
 th scales\; from nanometers as in biological tissues and bundles of carbon
  nanotubes\, to millimeters as in paper\nand insulation materials. The stu
 dy of fi \nber clustering of natural flocks could be useful for improving 
 fabrication processes\, \nsuch as in the paper and textile industries for 
 instance. \nHere\, we use the example of aegagropilae that are the remains
  of a seagrass (Posidonia oceanica) found on Mediterranean beaches. \nFirs
 t\, we characterize di\nfferent aspects of their structure and mechanical 
 response which make possible to draw some conclusions on their \nformation
  process in particular by analysing the statistical distributions of size 
 and mass of these balls. We show that these natural\naggregates are formed
  in open sea by random aggregation and compaction of  \nfibers which are h
 eld together by friction forces. \nFinally\, we report results from two la
 boratory experiments\, first on the behavior of a single fiber in a turbul
 ent von Karman flow where \nwe demonstrate that the conformations of flexi
 ble fibers in turbulence are analog to conformations of flexible polymers 
 \nin a solvent and then on the aggregation of fibers by a Stokes drift in 
 a wave-induced flow.
LOCATION:Seminar Room\, Lab Building East\, ISTA
ORGANIZER:rsix@ist.ac.at
SUMMARY:Patrice Le Gal: Aggregation of fibers by flows: structure\, mechani
 cs and formation of Aegagropilae
URL:https://talks-calendar.ista.ac.at/events/304
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