Response To 'comment On 'particle Concentration And Tube Size Dependence Of Viscosities Of Al_2o_3-water Nanofluids Flowing Through Micro-and Minitubes'' [appl. Phys. Lett. 94, 066101 (2009)]

摘要

We have reported that the viscosity of Al_2O_3-water nanofluids increases nonlinearly with particle concentration even in the very dilute range of 0.02-0.3 vol % and that the size of nanoparticles relative to the tube size has a profound influence on the viscosity of the nanofluids flowing through micrometer- and millimeter-sized circular tubes (supplied by Dae Dong Medical Co., Ltd.) in the fully developed laminar flow regime.rnIn this response paper, we address the two main issues raised in the comment of Ayela and Chevalier. First, Ayela and Chevalier argued that we have severely underestimated the uncertainty in effective viscosity of nanofluids mainly due to a strong underestimation of the uncertainty in tube diameter. Second, they appeared to assume that the nanofluids used in our experiments are commercially available ones and thus in the form of aggregates.