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This paper was presented at the 4th Micro and Nano Flows Conference (MNF2014), which was held at University College, London, UK. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute, ASME Press, LCN London Centre for Nanotechnology, UCL University College London, UCL Engineering, the International NanoScience Community, www.nanopaprika.eu. The viscosity of nanofluids is studied by molecular dynamics method. It is considered the model nanofluids based on liquid argon with aluminum and lithium nanoparticles. The nanoparticle size ranges from 1 to 4 nm. The volume concentration of nanoparticles is varied from 1% to 12%. It is shown that the viscosity of the nanofluid increases with decreasing nanoparticle size. Potential contribution to viscosity of nanofluid considerably exceeds the kinetic one. Therefore parameters of molecule-molecule and nanoparticle-molecule potentials make the considerable impact on viscosity of nanofluids which, thus, depends on material of nanoparticles. |
