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dc.contributor.authorMansoor, Mohammad M.
dc.contributor.authorMarston, J. O.
dc.contributor.authorUddin, J.
dc.contributor.authorChristopher, G.
dc.contributor.authorZhang, Z.
dc.contributor.authorThoroddsen, Sigurdur T
dc.date.accessioned2016-11-03T08:31:32Z
dc.date.available2016-11-03T08:31:32Z
dc.date.issued2016-05-05
dc.identifier.citationMansoor MM, Marston JO, Uddin J, Christopher G, Zhang Z, et al. (2016) Cavitation structures formed during the collision of a sphere with an ultra-viscous wetted surface. Journal of Fluid Mechanics 796: 473–515. Available: http://dx.doi.org/10.1017/jfm.2016.229.
dc.identifier.issn0022-1120
dc.identifier.issn1469-7645
dc.identifier.doi10.1017/jfm.2016.229
dc.identifier.urihttp://hdl.handle.net/10754/621531
dc.description.abstractWe investigate the inception of cavitation and resulting structures when a sphere collides with a solid surface covered with a layer of non-Newtonian liquid having a kinematic viscosity of up to (Formula presented.) cSt. We show the existence of shear-stress-induced cavitation during sphere approach towards the base wall (i.e. the pressurization stage) in ultra-viscous films using a synchronized dual-view high-speed imaging system. For the experimental parameters employed, liquids having viscoelastic properties of (Formula presented.) are shown to enable sphere rebound without any prior contact with the solid wall. Cavitation by depressurization (i.e. during rebound) in such non-contact cases is observed to onset after a noticeable delay from when the minimum gap distance is reached. Also, the cavities created originate from remnant bubbles, being the remains of the primary bubble entrapment formed by the lubrication pressure of the air during film entry. Cases where physical contact occurs (contact cases) in 10 000 cSt (Formula presented.) cSt films produce cavities attached to the base wall, which extend into an hourglass shape. In contrast, strikingly different structures occur in the most viscous liquids due to the disproportionality in radial expansion and longitudinal extension along the cavity length. Horizontal shear rates calculated using particle image velocimetry (PIV) measurements show the apparent fluid viscosity to vary substantially as the sphere approaches and rebounds away from the base wall. A theoretical model based on the lubrication assumption is solved for the squeeze flow in the regime identified for shear-induced cavity events, to investigate the criterion for cavity inception in further detail. © 2016 Cambridge University Press
dc.description.sponsorshipWe gratefully acknowledge support from the KAUST Office of Competitive Research Funds.
dc.publisherCambridge University Press (CUP)
dc.subjectcavitation
dc.subjectdrops and bubbles
dc.subjectviscoelasticity
dc.titleCavitation structures formed during the collision of a sphere with an ultra-viscous wetted surface
dc.typeArticle
dc.contributor.departmentHigh-Speed Fluids Imaging Laboratory
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of Fluid Mechanics
dc.contributor.institutionDepartment of Chemical Engineering, Texas Tech University, Lubbock, TX 79409-3121, USA
dc.contributor.institutionSchool of Mathematics, University of Birmingham, Edgbaston B15 2TT, UK
dc.contributor.institutionDepartment of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409-1021, USA
kaust.personMansoor, Mohammad M.
kaust.personThoroddsen, Sigurdur T.
kaust.acknowledged.supportUnitCompetitive Research Funds
dc.date.published-online2016-05-05
dc.date.published-print2016-06


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