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Vortex rings impinging on permeable boundaries

dc.creatorMujal-Colilles, Anna
dc.creatorDalziel, Stuart Bruce
dc.creatorBateman, Allen
dc.date.accessioned2018-11-24T23:17:59Z
dc.date.available2015-03-25T10:23:25Z
dc.date.available2018-11-24T23:17:59Z
dc.date.issued2015-01-17
dc.identifierhttps://www.repository.cam.ac.uk/handle/1810/247175
dc.identifier.urihttp://repository.aust.edu.ng/xmlui/handle/123456789/3207
dc.description.abstractExperiments with vortex rings impinging permeable and solid boundaries are presented in order to investigate the influence of permeability. Utilizing Particle Image Velocimetry, we compared the behaviour of a vortex ring impinging four different reticulated foams (with permeability k ∼ 26 − 85 × 10−8 m2) and a solid boundary. Results show how permeability affects the stretching phenomena of the vortex ring and the formation and evolution of the secondary vortex ring with opposite sign. Moreover, permeability also affects the macroscopic no-slip boundary condition found on the solid boundary, turning it into an apparent slip boundary condition for the most permeable boundary. The apparent slip-boundary condition and the flux exchange between the ambient fluid and the foam are jointly responsible for both the modified formation of the secondary vortex and changes on the vortex ring diameter increase.
dc.languageen
dc.publisherPhysics of Fluids
dc.subjectVortex rings
dc.subjectFoams
dc.subjectRotating flows
dc.subjectBoundary value problems
dc.subjectVelocimetry
dc.titleVortex rings impinging on permeable boundaries
dc.typeArticle


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