Thermophysical properties of aqueous nanofluids modified with carbon nanostructures

The results of the study of thermal conductivity and viscosity of water-based nanofluids modified with commercial detonation nanodiamond (DND) purified under self-propagating high-temperature synthesis conditions are presented, which made it possible to obtain a dispersion of up to 90 nm. Also, using this purification technique, it became possible to obtain stable nanofluids based on DND with a content of up to 1 vol.%, as well as to get an increase in thermal conductivity of up to 26% at 55$^\circ$C, but the addition of DND led to an increase in the viscosity of the final nanofluid to 62%. The experimental data were compared with theoretical calculations using models to establish the most important parameters for obtaining high thermal conductivity. Another carbon nanomaterial, few-layer graphene, which has a thermal conductivity similar to DND, was also compared.