منابع مشابه
Approach to universality in axisymmetric bubble pinch-off.
The pinch-off of an axisymmetric air bubble surrounded by an inviscid fluid is compared in four physical realizations: (i) cavity collapse in the wake of an impacting disk, (ii) gas bubbles injected through a small orifice, (iii) bubble rupture in a straining flow, and (iv) a bubble with an initially necked shape. Our boundary-integral simulations suggest that all systems eventually follow the ...
متن کاملAxisymmetric bubble pinch-off at high Reynolds numbers.
Analytical considerations and potential-flow numerical simulations of the pinch-off of bubbles at high Reynolds numbers reveal that the bubble minimum radius, rn, decreases as tau proportional to r2n sqrt[1lnr2n], where tau is the time to break up, when the local shape of the bubble near the singularity is symmetric. However, if the gas convective terms in the momentum equation become of the or...
متن کاملVisualisation of multiple vortex rings from an axisymmetric synthetic jet
Synthetic jets have been an area of interest in the recent years with constantly increasing industrial demand. Application areas are widespread and a strong focus is put on boundary layer control as well as on mixing enhancement. A synthetic jet has been studied using physical experiments involving high-speed camera footage and smoke visualisation. Additionally, threedimensional transient numer...
متن کاملSound Generated by a Pair of Axisymmetric Coaxial Vortex Rings
The time-dependent acoustic field generated by the mutual interaction of a pair of coaxial viscous vortex rings advecting along a common axis of symmetry is simulated using a two-step numerical procedure. In the first step, the flowfield is predicted by solving the incompressible Navier–Stokes equations. In the second step, Powell’s vortex sound theory is used to predict the far-field acoustic ...
متن کاملStatistical equilibrium theory for axisymmetric flows: Kelvin’s variational principle and an explanation for the vortex ring pinch-off process
Thermodynamics of vorticity density fields ~v/r! in axisymmetric flows are considered, and the statistical equilibrium theories of Miller, Weichman, and Cross @Phys. Rev. A 45, 2328 ~1992!#, Robert and Sommeria @J. Fluid Mech. 229, 291 ~1991!#, and Turkington @Comm. Pure Appl. Math. 52, 781 ~1999!# for the two-dimensional flows in Cartesian coordinates are extended to axisymmetric flows. It is ...
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2014
ISSN: 0022-1120,1469-7645
DOI: 10.1017/jfm.2013.639