Open AccessAspherical bubble dynamics and oscillation times
Author(s) -
A. Vogel,
J. Noack,
E.J. Chapyak,
R.P. Godwin
Publication year - 1999
Language(s) - English
Resource type - Reports
DOI - 10.2172/350954
Subject(s) - bubble , cavitation , oscillation (cell signaling) , hydrophone , mechanics , dynamics (music) , volume (thermodynamics) , spherical cap , optics , materials science , soap bubble , rayleigh scattering , physics , acoustics , geometry , chemistry , mathematics , thermodynamics , biochemistry
The cavitation bubbles common in laser medicine are rarely perfectly spherical and are often located near tissue boundaries, in vessels, etc., which introduce aspherical dynamics. Here, novel features of aspherical bubble dynamics are explored by time-resolved photography and numerical simulations. The growth-collapse period of cylindrical bubbles of large aspect ratio (length:diameter {approximately}20) differs only slightly from twice the Rayleigh collapse time for a spherical bubble with an equivalent maximum volume. This fact justifies using the temporal interval between the acoustic signals emitted upon bubble creation and collapse to estimate the maximum bubble volume. As a result, hydrophone measurements can provide an estimate of the bubble size and energy even for aspherical bubbles. The change of the oscillation period of bubbles near solid walls and elastic (tissue-like) boundaries relative to that of isolated spherical bubbles is also investigated