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Analysis on the Motion of Particles Agitated by Ultrasound and Immersed in a Host Medium, with Application to Viscosity Measurement

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Glass spherical particles (mean diameter of 250 m), immersed in a liquid host medium with a controlled temperature of 30 °C, were agitated by a 2.7 MHz ultrasonic pumping wave during 990 ms. A probing wave of 10.0 MHz continuously radiated the particles and from the power spectrum of the scattered wave, the time-decay of the particle ensemble mean squared velocity was determined following the switching off of the pumping transducer. This time-decay is shown to be proportional to the host medium viscosity. Degassed distilled water was used as a calibrating medium. The method was tested using two mixtures of glycerin and degassed distilled water and a sample of human blood plasma. The measured viscosity, within the range of 15·10−4Nsm−2 to 43·10−4Nsm−2, presented an error less than 8.0% when compared with the results obtained by different methods.
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Document Type: Research Article

Publication date: 1999-11-01

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  • 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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