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|Title:||Viscous heating effect on the drag reduction of a bubble towards a near-contact wall||Authors:||Chen, S.B.||Issue Date:||Apr-2004||Citation:||Chen, S.B. (2004-04). Viscous heating effect on the drag reduction of a bubble towards a near-contact wall. Physics of Fluids 16 (4) : 889-896. ScholarBank@NUS Repository.||Abstract:||This work theoretically investigates the thermal effect of viscous dissipation on the drag force of a fast moving spherical bubble in a Newtonian liquid towards a near-contact planar wall. The bubble is small and is close enough to the wall so that creeping flow conditions are achieved in the thin gap. A lubrication analysis is employed to simplify the momentum and energy equations. For low wall thermal conductivity, simple governing equations can be derived and then solved numerically. At sufficiently high constant velocity, the drag force can be substantially reduced due to the viscosity decrease caused by viscous heating in the thin film. Under the action of a prescribed external force, the bubble velocity can be considerably increased at sufficient closeness to the wall, as compared with that if the viscosity were temperature independent. © 2004 American Institute of Physics.||Source Title:||Physics of Fluids||URI:||http://scholarbank.nus.edu.sg/handle/10635/90478||ISSN:||10706631|
|Appears in Collections:||Staff Publications|
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