Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
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Determining the flow curves for an inverse ferrofluid

  • Ekwebelam, C.C. (The School of Chemical and Biomolecular Engineering, The University of Sydney) ;
  • See, H. (The School of Chemical and Biomolecular Engineering, The University of Sydney)
  • Published : 2008.03.31
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Abstract

An inverse ferrofluid composed of micron sized polymethylmethacrylate particles dispersed in ferrofluid was used to investigate the effects of test duration times on determining the flow curves of these materials under constant magnetic field. The results showed that flow curves determined using low duration times were most likely not measuring the steady state rheological response. However, at longer duration times, which are expected to correspond more to steady state behaviour, we noticed the occurrence of plateau and decreasing flow curves in the shear rate range of $0.004\;s^{-1}$ to ${\sim}20\;s^{-1}$, which suggest the presence of nonhomogeneities and shear localization in the material. This behaviour was also reflected in the steady state results from shear start up tests performed over the same range of shear rates. The results indicate that care is required when interpreting flow curves obtained for inverse ferrofluids.

Keywords

References

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