| Tartalmi leírás: |
The dynamics of a harmonically driven spherical gas/vapour
bubble has been studied intensely in the last decades. The
collapse of a bubble induce extreme conditions, such as high
pressure and temperature or even shock waves. The ultrasonic
technology exploit these conditions in various fields of
industry, for example, ultrasonic pasteurization, alteration
of the viscosity of thixotropic fluids, production of new
kind of copolymers, or in cancer therapy. The present study
intends to aid the applications through the numerical
investigation of a harmonically excited spherical gas bubble
placed in the highly viscous glycerine. We seek parameter
regions where the bubble wall velocities as high as possible,
perhaps even higher than the sound speed in the liquid
domain. Such kind of high amplitude, collapse-like radial
oscillations are difficult to find due to the very high
viscosity, which is approximately three orders of magnitude
greater than of water. The two investigated parameters were
the pressure amplitude and the frequency of the harmonic
forcing. The applied model was the Keller?Miksis equation,
which is a second order nonlinear ordinary differential
equation, describing the bubble wall motion and taking into
account liquid compressibility as a first order
approximation.
|
| Azonosító: |
Klapcsik, Kálmán and Hegedűs, Ferenc (2015) Two-Parameter Bifurcation Analysis for the Seeking of High Amplitude Oscillation of a Periodically Driven Gas Bubble in Glycerine. In: Proceedings of Conference on Modelling Fluid Flow (CMFF'15). CFD.HU Kft., Budapest, pp. 1-8. ISBN 978-963-313-190-9
|
