Resonance absorption of ultrasonic waves in a magnetic fluid

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Authors

  • A. SKUMIEL Institute of Acoustics, Adam Mickiewicz University, Poland
  • M. ŁABOWSKI Institute of Acoustics, Adam Mickiewicz University, Poland
  • A. JÓZEFCZAK Institute of Acoustics, Adam Mickiewicz University, Poland

Abstract

An external magnetic field applied to a magnetic fluid gives rise to the appearance of spherical and chain-like clusters. The present work is based on an acoustic method permitting the determination of the presence and size of the clusters by resonance absorption of an ultrasonic wave in a magnetic fluid under the influence of a magnetic field. Measurements by applying the pulse method of the variations of the ultrasonic absorption coefficient Δα for three frequencies in a selected magnetic fluid versus the external magnetic field strength have been reported.

References

[1] R.W. CHANTRELL, A. BRADBURY, J. POPPLEWELL and S.W. CHARLES, Agglomerate formation in a magnetic fluid, J. Appl. Phys., 53, 2742-2744 (1982).

[2] H.W. DAVIES and J.P. LLEWELLYN, Magnetic birefringence of ferrofluids, J. Phys. D: Appl. Phys., 12, 311-319 (1979).

[3] W. FERTMAN, Magnetic liquids [in Russian], High School, Minsk 1988.

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