期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 11, 期 6, 页码 1513-1520出版社
SPRINGER
DOI: 10.1007/s11051-009-9599-9
关键词
Rheological behaviour; Ethylene glycol; Titanate nanotube; Nanofluid; Thermal conductivity
资金
- UK EPSRC [EP/E00041X/1, EP/F015380/1]
- EPSRC [EP/F015380/1, EP/F023014/1, EP/E00041X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F015380/1, EP/F023014/1, EP/E00041X/1] Funding Source: researchfish
Experimental work has been performed on the rheological behaviour of ethylene glycol based nanofluids containing titanate nanotubes over 20-60 degrees 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 similar to 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.
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