Acoustic microstreaming near a plane wall due to a pulsating free or coated bubble: velocity, vorticity and closed streamlines. (25th September 2019)

• Record Type: Journal Article
• Authors: Mobadersany, Nima; Sarkar, Kausik
• Is Part Of: Journal of fluid mechanics. Volume 875(2019)
• Page Start: 781
• Page End: 806
• Publication Date: 2019-09-25
• Subjects: bubble dynamics, -- cavitation; Fluid mechanics -- Periodicals; 532.005
• DOI: 10.1017/jfm.2019.478
• Languages: English
• ISSNs: 0022-1120

Abstract

Abstract : Acoustic microstreaming due to an oscillating microbubble, either coated or free, is analytically investigated. The detailed flow field is obtained and the closed streamlines of the ring vortex generated by microstreaming are plotted in both Eulerian and Lagrangian descriptions. Analytical expressions are found for the ring vortex showing that its length depends only on the separation of the microbubble from the wall and the dependence is linear. The circulation as a scalar measure of the vortex is computed quantitatively identifying its spatial location. The functional dependence of circulation on bubble separation and coating parameters is shown to be similar to that of the shear stress.