Article

Acoustic cavitation, bubble dynamics and sonoluminescence.

Drittes Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany.
Ultrasonics Sonochemistry (Impact Factor: 3.82). 05/2007; 14(4):484-91. DOI: 10.1016/j.ultsonch.2006.09.017
Source: PubMed

ABSTRACT Basic facts on the dynamics of bubbles in water are presented. Measurements on the free and forced radial oscillations of single spherical bubbles and their acoustic (shock waves) and optic (luminescence) emissions are given in photographic series and diagrams. Bubble cloud patterns and their dynamics and light emission in standing acoustic fields are discussed.

0 Followers
 · 
99 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: The dynamics of cavitation bubble is analyzed in the compressible fluid by use of the boundary integral equation considering the compressibility. After the vertical incidence of plane wave to the rigid wall, the motion characteristics of single cavitation bubble near the rigid wall with initial equilibrium state are researched with different parameters. The results show that after the driving of acoustic wave, the cavitation bubble near the rigid wall will expand or contract, and generate the jet pointing to the wall. Also, the existence of the wall will elongate time for one oscillation. With the compressible model, the oscillation amplitude is reduced, as well as the peak value of inner pressure and jet tip velocity. The effect of the wall on oscillation amplitude is limited. However with the increment of initial vertical distance, the effect of wall on the jet velocity is from acceleration to limitation, and finally to acceleration again.
    China Ocean Engineering 03/2015; 29(1). DOI:10.1007/s13344-015-0002-6 · 0.41 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: In our previous study we proposed the use of chemical penetration enhancers for noninvasive detection of fetus abnormalities that can also be utilized for direct fetal drug delivery. In an attempt to further increase the mass transport rate across the amniotic membrane, thus shortening the procedure and improving the applicability of the proposed procedure, the effect and mechanism of combining ultrasound exposure with chemical penetration enhancers' application were assessed. The combined effect was evaluated in vitro on post-delivery human amniotic membrane and ex vivo on rat's whole amniotic sac. Ultrasound effect has been assessed by dye experiments using a customized image analysis program. Additional insights of ultrasound effect's mechanism on biological membranes are presented. Previously we have determined that chemical penetration enhancers affect the fetal membranes via two mechanisms termed as 'extractors' and 'fluidizers'. In this study, we found that combining ultrasound with a 'fluidizer' CPE (e.g. bupivacaine) results in a synergistic enhancement (90-fold) of fetal membrane's mass transport, while combining ultrasound with 'extractors' (e.g. ethanol and NMP) results in an antagonistic effect. The combined procedure is faster and gain greater accuracy than the applications of sole chemical penetration enhancers. Copyright © 2014. Published by Elsevier B.V.
    Journal of Controlled Release 12/2014; 200. DOI:10.1016/j.jconrel.2014.12.025 · 7.26 Impact Factor
  • Source

Preview

Download
0 Downloads
Available from