Importance of acoustic shielding in sonochemistry

M.M. Iersel, van, N.E. Benes, J.T.F. Keurentjes

    Research output: Contribution to journalArticleAcademicpeer-review

    40 Citations (Scopus)


    It is well known that sonochemistry is less efficient at high acoustic intensities. Many authors have attributed this effect to decoupling losses and shielding of the acoustic wave. In this study we investigate both phenomena for a 20 kHz ultrasound field with an intensity ranging from 40 to 150 W/cm2. Visualization of the bubble cloud has demonstrated that the void fraction below the ultrasound horn increases more than proportional with increasing power input. Nevertheless, the energy coupling between the horn and the liquid remains constant; this implies that decoupling losses are not reinforced for larger bubble clouds. On the contrary, microphone measurements have shown that due to the larger bubble cloud a substantial part of the supplied energy is lost at high power inputs. In striving towards more efficient sonochemistry, reduction of shielding appears as one of the major challenges.
    Original languageEnglish
    Pages (from-to)294-300
    JournalUltrasonics Sonochemistry
    Issue number4
    Publication statusPublished - 2008

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