Archives of Acoustics, 33, 4(S), pp. 105–110, 2008

Resonance Attenuation of Ultrasonic Waves in a High Viscosity Magnetic Liquid

Karolina CHARAZIAK
Adam Mickiewicz University Faculty of Physics, Institute of Acoustics

Marcin MARECKI
Adam Mickiewicz University Faculty of Physics, Institute of Acoustics

Tomasz HORNOWSKI
Adam Mickiewicz University Faculty of Physics, Institute of Acoustics

Arkadiusz JÓZEFCZAK
Adam Mickiewicz University Faculty of Physics, Institute of Acoustics

Andrzej SKUMIEL
Adam Mickiewicz University Faculty of Physics, Institute of Acoustics


Ultrasonic waves attenuation as a function of frequency in a magnetic fluid APG-832 containing magnetite particles dispersed in a synthetic hydrocarbon was investigated. The measurements were carried out using broadband method in which ultrasonic pulse that has traveled through the sample is analyzed using a Fourier transform algorithm to determine the spectra of amplitude and phase and therefore to estimate the attenuation and dispersion of a given medium. Ultrasonic attenuation spectra of APG-832 magnetic liquid were measured between 1 and 10 MHz at 20 and 40±C. In the presence of the external magnetic field attenuation spectra at 20±C exhibited a single peak at frequency about 3 MHz. Experimental results were analyzed using concept of the resonance absorption of an ultrasonic wave in a magnetic fluid acted on by a magnetic field.
Keywords: magnetic liquid, ultrasonic waves, resonance attenuation
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