Effective Viscosity of the nanofluids: Experimental studying and molecular dynamics simulation

V.Ya. Rudyak, S.V. Dimov, S.L. Krasnolutsky, D.A. Ivanov
Novosibirsk State University of Architecture & Civil Engineering, RU

Keywords: nanofluids, viscosity, molecular dynamics, temperature dependence


The studying the effective viscosity coefficient of the nanofluids is the object of present paper. Experimentally the viscosity of the nanofluids on basis of ethylene glycol and SiO2 nanoparticles was studied. It was shown that the nanofluid viscosity coefficient depended substantially on the nanoparticles sizes. The experiments are carried out for the nanofluids with three sizes of nanoparticles: 18.1, 28.3 and 46.5 nm. The nanofluid with the smaller nanoparticle has the higher viscosity. All obtained data are approximated well by the simple quadratic correlation. The temperature dependence of the viscosity coefficient has been investigated in temperature range from 20oC till 60oC. The viscosity coefficient decrease when the fluid temperature increases. However its temperature dependence is determined mainly by the temperature dependence of the viscous coefficient of the basis fluid. The dependence of the nanofluid viscosity on nanoparticle volume concentration and their material was studied also by molecular dynamics method. The viscosity of the nanofluid on basis of argon liquid with the 2 nm Li and Zn particles was carried out. The molecule-particle interaction was described by the Rudyak-Krasnolytsky potential while the nanoparticles interaction was described by new potential developed recently by the authors.