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CATEGORIES:Institute for Energy and Environmental Flows (IEEF
 )
SUMMARY:On the origin of the hydraulic jump in a thin liqu
 id film  - Rajat Bhagat\, Dept of Chemical Enginee
 ring\, Uni of Cambridge
DTSTART;TZID=Europe/London:20180503T113000
DTEND;TZID=Europe/London:20180503T123000
UID:TALK104395AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/104395
DESCRIPTION: For more than a century\, it has been believed th
 at all hydraulic jumps are created due to gravity.
  However\, we found that thin-film hydraulic jumps
  are not induced by gravity. This study explores t
 he initiation of thin-film hydraulic jumps. For ci
 rcular jumps produced by the normal impingement of
  a jet onto a solid surface\, we found that the ju
 mp is formed when surface tension and viscous forc
 es balance the momentum in the film and gravity pl
 ays no significant role. Experiments show no depen
 dence on the orientation of the surface and a scal
 ing relation balancing viscous forces and surface 
 tension collapses the experimental data. Experimen
 ts on thin film planar jumps in a channel also sho
 w that the predominant balance is with surface ten
 sion\, although for the thickness of the films we 
 studied gravity also played a role in the jump for
 mation. A theoretical analysis shows that the down
 stream transport of surface tension energy is the 
 previously neglected\, critical ingredient in thes
 e flows and that capillary waves play the role of 
 gravity waves in a traditional jump in demarcating
  the transition from the supercritical to subcriti
 cal flow associated with these jumps. 
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3
  0EZ
CONTACT:Catherine Pearson
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