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Interparticle Forces on Red Cells in a Standing Wave Field

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When micron-size particles are suspended in a host liquid and subjected to a sufficiently energetic standing wave field, they will experience a time-averaged force due to acoustic radiation pressure as well as interparticle or secondary acoustic field forces. We present some new observations, both theoretical and experimental, concerning the effects of the mutual interaction between micron-size particles in a standing wave field. Our analysis deals with a quasi-static situation in which the gravitational force acting on the particles is balanced by the time-averaged acoustic force. We conclude with some observations made in the laboratory which agree well with theoretical predictions.

Zusammenfassung

Wenn Teilchen im Größenbereich 1 μm in einer geeigneten Flüssigkeit suspendiert und einem genügend energiereichen Feld stehender Schallwellen ausgesetzt werden, so erfahren die Teilchen dadurch im Zeitmittel eine konstante Kraft. Diese rührt einerseits vom Strahlungsdruck der Schallwellen her, andererseits von Wechselwirkungen zwischen den Teilchen oder sekundären akustischen Feldeffekten. Wir stellen neue Beobachtungen vor, die die Auswirkungen der Wechselwirkungen zwischen den Teilchen in einem stehenden Wellenfeld beschreiben und geben eine theoretische Erklärung. Unsere Betrachtung behandelt den Fall des Gleichgewichtes zwischen der Gravitationswechselwirkung und dem zeitlichen Mittel der akustischen Wechselwirkung auf die Teilchen. Unsere experimentellen Beobachtungen stimmen mit den Vorhersagen dieser Theorie überein.

Sommaire

Lorsque des particules de la taille du micron sont placées en suspension dans un liquide et sont exposées à un champ d'ondes acoustiques stationnaires d'énergie suffisante, elles se trouvent soumises à une force de valeur moyenne non nulle provenant de la pression de radiation acoustique et, d'autre part, à des forces interparticulaires dues aux champs acoustiques secondaires. Nous présentons ici des observations nouvelles, théoriques et expérimentales, concernant les effets de l'interaction mutuelle entre particules de la taille du micron placées dans un champ d'ondes stationnaires. Notre analyse porte sur une situation quasi-statique dans laquelle la force de gravitation agissant sur les particules est équilibrée par la moyenne temporelle de la force acoustique. Pour finir nous présentons des observations faites au laboratoire et qui s'accordent avec nos prédictions théoriques.
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Document Type: Research Article

Publication date: October 1, 1984

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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