Rheological properties and dispersion stability of magnetorheological (MR) suspensions

B. D. Chin, Jong Hyeok Park, M. H. Kwon, O. O. Park

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

In the present article, the rheological responses and dispersion stability of magnetorheological (MR) fluids were investigated experimentally. Suspensions of magnetite and carbonyl iron particles were prepared as model MR fluids. Under an external magnetic field (Ho) and a steady shear flow, the yield stress depends upon Ho3/2. The Yield stress depended on the volume fraction of the particle (φ) linearly only at low concentration and increased faster at high fraction. Rheological behavior of MR fluids subjected to a small-strain oscillatory shear flow was investigated as a function of the strain amplitude, frequency, and the external magnetic field. In order to improve the stability of MR fluid, ferromagnetic Co-Γ-Fe2O3 and CrO2 particles were added as the stabilizing and thickening agent in the carbonyl iron suspension. Such needle-like particles seem to play a role in the steric repulsion between the relatively large carbonyl iron particles, resulting in improved stability against rapid sedimentation of dense iron particles. Furthermore, the additive-containing MR suspensions exhibited larger yield stress, especially at higher magnetic field strength.

Original languageEnglish
Pages (from-to)211-219
Number of pages9
JournalRheologica Acta
Volume40
Issue number3
DOIs
Publication statusPublished - 2001 Jan 1

Fingerprint

Magnetorheological fluids
magnetorheological fluids
Suspensions
Iron
Yield stress
Shear flow
Magnetic fields
iron
Ferrosoferric Oxide
shear flow
Excipients
Magnetite
Sedimentation
magnetic fields
Needles
Volume fraction
needles
magnetite
low concentrations
field strength

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Chin, B. D. ; Park, Jong Hyeok ; Kwon, M. H. ; Park, O. O. / Rheological properties and dispersion stability of magnetorheological (MR) suspensions. In: Rheologica Acta. 2001 ; Vol. 40, No. 3. pp. 211-219.
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Rheological properties and dispersion stability of magnetorheological (MR) suspensions. / Chin, B. D.; Park, Jong Hyeok; Kwon, M. H.; Park, O. O.

In: Rheologica Acta, Vol. 40, No. 3, 01.01.2001, p. 211-219.

Research output: Contribution to journalArticle

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