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Title:
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Experimental study on inter-particle acoustic forces
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Author:
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Garcia Sabaté, Anna; González Cinca, Ricardo; Hoyos, Mauricio; Castro, Angelica
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. NOLIN - Física No-Lineal i Sistemes Fora de l'Equilibri |
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Abstract:
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A method for the experimental measurement of inter-particle forces (secondary Bjerknes force) generated by the action of an acoustic field in a resonator micro-channel is presented. The acoustic radiation force created by an ultrasonic standing wave moves suspended particles towards the pressure nodes and the acoustic pressure induces particle volume oscillations. Once particles are in the levitation plane, transverse and secondary Bjerknes forces become important. Experiments were carried out in a resonator filled with a suspension composed of water and latex particles of different size (5–15 lm) at different concentrations. Ultrasound was generated by means of a 2.5 MHz nominal frequency transducer. For the first time the acoustic force generated by oscillating
particles acting on other particles has been measured, and the critical interaction distance in various cases has been determined. Inter-particle forces on the order of 10 14 N have been measured by
using this method |
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Subject(s):
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-Àrees temàtiques de la UPC::Física
-Elastic solids--Acoustic properties
-Elastic solids
-Fluxos |
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Rights:
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Document type:
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Article - Published version
Article |
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Published by:
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Acoustical Society of America
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