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SUMMARY:Surface texturing for turbulent friction reduction - Ricardo Garci
 a-Mayoral\, Engineering\, University of Cambridge
DTSTART:20141030T113000Z
DTEND:20141030T123000Z
UID:TALK54623@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:This talk will review the drag-reduction capabilities of rible
 ts and superhydrophobic surfaces\, with particular emphasis on the physica
 l mechanisms at play. Riblets are a special type of roughness made up of s
 mall surface grooves aligned in the direction of the flow. Textured superh
 ydrophobic surfaces\, when immersed in water\, can entrap pockets of air\,
  so that a water stream can effectively slip over them. In both cases\, th
 e reduction of friction is proportional to the texture size\, for vanishin
 gly small sizes. At larger sizes\, different phenomena appear\, degrading 
 the performance and limiting the range of sizes of technological interest.
  We will discuss both the drag-reducing and the drag-degrading mechanisms\
 , and propose coatings with directional porosity as an alternative to ribl
 ets. 
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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