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SUMMARY:Cleaning soil layers by impinging liquid jets - Ian Wilson\, Dept 
 of Chemical Engineering (University of Cambridge)
DTSTART:20200312T113000Z
DTEND:20200312T123000Z
UID:TALK137248@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Impinging liquid jets are widely used for removing films or la
 yers\, either by distributing a solution which effects removal or by suppl
 ing hydraulic forces to push the layer out of the way or overcome its adhe
 sion to the underlying substrate. Our work is this area comes from an inte
 rest in cleaning tanks\, originally the ones used in the food and pharma s
 ectors and on ships\, but the results turn out to be applicable to the mil
 itary variety.  This presentation will describe work on the underlying flu
 id mechanics of the liquid films generated by impinging jets\, which give 
 high local shear stresses and lead to hydraulic jumps. We have found that 
 the removal of viscoplastic soils and other complex fluids is dictated by 
 the momentum in the film. A simple kinetic law was developed for this whic
 h gives a very good description of observed cleaning behaviour. Very recen
 tly we have found a phenomenological basis for this kinetic law\, which wi
 ll be presented. The presentation will feature demonstrations. Stuart Clar
 ke will get wet.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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