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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)]
4.J. B. Gordon, Private Seminar MIT, Boston, MA, 20 April 2006 (unpublished).
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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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