On the Controversy of Nanofluid Rheological Behavior

  • Leyla Raeisian
  • Jan Rudolf Eggers
  • Eckart Matthias LangeEmail author
  • Torsten Mattke
  • Andreas Bode
  • Stephan Kabelac


Different findings about suitable correlations to describe nanofluid viscosity can be explained based on the research presented in this paper. The effective viscosity of nanofluids is crucial when nanofluids are considered as heat carrier fluids. Despite many publications, however, no consensus about suitable correlations could be found in past years. Particularly, the impact of the shear rate on the viscosity is being discussed controversially. It is shown in this paper that these different findings can be explained considering the theory for the rheology of suspensions. Any measurement of viscosity over shear rate only shows a section of the entire rheological behavior. Thus, experimental results of shear thinning, Newtonian behavior and shear thickening of nanofluids can all be a part of this overall range of possible shear rates. This hypothesis is validated based on viscosity data from the literature and viscosity measurements over a wide range of shear rates for different nanofluids showing all three types of behavior.


Nanofluids Shear rate Shear thickening Shear thinning Viscosity 



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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Leyla Raeisian
    • 1
  • Jan Rudolf Eggers
    • 1
  • Eckart Matthias Lange
    • 1
    Email author
  • Torsten Mattke
    • 2
  • Andreas Bode
    • 2
  • Stephan Kabelac
    • 1
  1. 1.Institute of ThermodynamicsLeibniz University HannoverHannoverGermany
  2. 2.BASF SELudwigshafen am RheinGermany

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