Interparticle Collisions Driven by Ultrasound

DOI Web Site 被引用文献15件
  • Stephen J. Doktycz
    School of Chemical Scicnces, University of Illinois at Urbana-Champaign, Urbana, IL 61801.
  • Kenneth S. Suslick
    School of Chemical Scicnces, University of Illinois at Urbana-Champaign, Urbana, IL 61801.

説明

<jats:p>Ultrasound has become an important synthetic tool in liquid-solid chemical reactions, but the origins of the observed enhancements remained unknown. The effects of high-intensity ultrasound on solid-liquid slurries were examined. Turbulent flow and shock waves produced by acoustic cavitation were found to drive metal particles together at sufficiently high velocities to induce melting upon collision. A series of transition-metal powders were used to probe the maximum temperatures and speeds reached during such interparticle collisions. Metal particles that were irradiated in hydrocarbon liquids with ultrasound underwent collisions at roughly half the speed of sound and generated localized effective temperatures between 2600°C and 3400°C at the point of impact for particles with an average diameter of ∼10 μm.</jats:p>

収録刊行物

  • Science

    Science 247 (4946), 1067-1069, 1990-03-02

    American Association for the Advancement of Science (AAAS)

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