Effect of particle volume fraction on the velocity of sound in magnetorheological fluids

Jaime Rodríguez-López, Luis Elvira, Richard O'Leary, Francisco Montero de Espinosa

Research output: Chapter in Book/Report/Conference proceedingConference contribution book


In this work the velocity of sound in magnetorheological fluids as a function of the particle volume fraction is presented. The influence of the magnetic field on the sound speed and on the material microstructure is also analyzed. It is shown that particles in suspension interact to form complex microstructures which depend on the volume fraction. The range of particle volume fractions studied goes from 1% up to 10%. In the absence of magnetic field, there is a decrease in the velocity of sound as the particle volume fraction is increased, which agrees with the predictions of theoretical models. In an applied magnetic field, the microstructure passes from a suspension to an ordered structure, resulting in an increase velocity of sound. For low volume fractions a model of fiber suspensions predicts the microstructure formed in accordance to the experimental velocity of sound measured. On the other hand, for higher volume fractions, the microstructure can be considered as a porous material and the increase of sound velocity can be qualitatively explained from this theoretical point of view. These results are compared to microstructure images obtained using optical methods.
Original languageEnglish
Title of host publicationInternational Congress on Ultrasonics
Subtitle of host publicationGdańsk 2011
EditorsBogumil B J Linde, Jacek Pączkowski, Nikodem Ponikwicki
Place of PublicationMelville, NY
Number of pages4
Publication statusPublished - 24 May 2012
EventInternational Congress Ultrasonics 2011 - Gdansk, Poland
Duration: 5 Sept 20118 Sept 2011

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X


ConferenceInternational Congress Ultrasonics 2011
Internet address


  • acoustic wave velocity
  • suspended particles
  • magnetic field
  • acoustic modeling


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