Thermal conductivity and viscosity of glycerine-water based Cu-SiO2 hybrid nanofluids

Abstract

Thermal conductivity and dynamic viscosity of Cu-SiO2/23.5 nm hybrid nanofluids produced in a glycerine-water (30:70 by volume) combination base liquid are presented. Nanofluids with concentrations of 0.2, 0.6, and 1.0 percent are synthesized, and measurements are taken at temperatures ranging from 20 to 80 °C. FESEM, EDS, and XRD are used to determine the particle size distribution, elemental content, and crystal structure of nanoparticles. The LVDV-2 Brookfield Viscometer is used to determine viscosity. The TPS 500S thermal constants hot disc analyzer is used to evaluate thermal conductivity. The viscosity of nanofluids rises with volume concentration and falls with temperature. Nanofluids' thermal conductivity rose as volume concentration and temperature increased. At 20 °C, 1.0 percent hybrid nanofluids have a maximum viscosity of 4.009 cP, which is higher than the base liquid viscosity of 3.040 cP. For hybrid nanofluids, thermal conductivity is measured to be 1.042 W/mK at 1.0 percent concentration at 80 °C.