Rheological behaviour of ethylene glycol-titanate nanotube nanofluids

Haisheng Chen, Yulong Ding, Alexei Lapkin, Xiaolei Fan

Research output: Journal PublicationArticlepeer-review

133 Citations (Scopus)

Abstract

Experimental work has been performed on the rheological behaviour of ethylene glycol based nanofluids containing titanate nanotubes over 20-60 °C and a particle mass concentration of 0-8%. It is found that the nanofluids show shear-thinning behaviour particularly at particle concentrations in excess of ~2%. Temperature imposes a very strong effect on the rheological behaviour of the nanofluids with higher temperatures giving stronger shear thinning. For a given particle concentration, there exists a certain shear rate below which the viscosity increases with increasing temperature, whereas the reverse occurs above such a shear rate. The normalised high-shear viscosity with respect to the base liquid viscosity, however, is independent of temperature. Further analyses suggest that the temperature effects are due to the shear-dependence of the relative contributions to the viscosity of the Brownian diffusion and convection. The analyses also suggest that a combination of particle aggregation and particle shape effects is the mechanism for the observed high-shear rheological behaviour, which is also supported by the thermal conductivity measurements and analyses.

Original languageEnglish
Pages (from-to)1513-1520
Number of pages8
JournalJournal of Nanoparticle Research
Volume11
Issue number6
DOIs
Publication statusPublished - Aug 2009
Externally publishedYes

Keywords

  • Ethylene glycol
  • Nanofluid
  • Rheological behaviour
  • Thermal conductivity
  • Titanate nanotube

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry (all)
  • Atomic and Molecular Physics, and Optics
  • Modelling and Simulation
  • Materials Science (all)
  • Condensed Matter Physics

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