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Comment on “Particle concentration and tube size dependence of viscosities of —water nanofluids flowing through micro- and minitubes” [Appl. Phys. Lett.91, 243112 (2007)]
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1.
1.E. V. Timofeeva, A. N. Gavrilov, J. M. McCloskey, Y. V. Tolmachev, S. Sprunt, L. M. Lopatina, and J. V. Selinger, Phys. Rev. E 76, 061203 (2007).
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5.S. P. Jang, J. H. Lee, K. S. Hwang, and S. U. S. Choi, Appl. Phys. Lett. 91, 243112 (2007).
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Image of FIG. 1.

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FIG. 1.

Effective viscosity values in Ref. 5 assigned with ±5% uncertainty. An overlap of the data can now be fitted by a linear evolution that does not depend on the tube diameter.

Image of FIG. 2.

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FIG. 2.

Results in Fig. 1 plotted as a function of the ratio of the nanoparticle diameter to the tube diameter. Error bars have been plotted for and values, and the lines obey the fit for each of these two volume concentrations.

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2009-02-09
2014-04-17

Abstract

In a recent letter, Jang et al. [Appl. Phys. Lett.91, 243112 (2007)] reported an anomalous viscosity enhancement for very dilute nanofluids . They claim that the size of nanoparticles relative to the tube size has a profound influence on the viscosity of the nanofluids flowing through micro- and minichannels in a fully developed laminar flow. The authors used nanoparticles with a mean diameter of dispersed in water. We believe that their interpretation of these experiments is questionable because they have underestimated the importance of experimental uncertainties. A conventional explanation of their results can be drawn from simple hypothesis.

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Scitation: Comment on “Particle concentration and tube size dependence of viscosities of Al2O3—water nanofluids flowing through micro- and minitubes” [Appl. Phys. Lett.91, 243112 (2007)]
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/6/10.1063/1.3078393
10.1063/1.3078393
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