Research on stability and thermal properties of SiC-MWCNT hybrid nanofluids based on thermal conductive oil

Hybrid nanofluids have research potential and value in heat exchange. In this study, the stability, thermal conductivity and viscosity of thermally conductive oil-based silicon carbide-multi-walled carbon nanotube (SiC-MWCNT/Oil) hybrid nanofluids were investigated under different conditions. It was observed that the SiC-MWCNT/Oil hybrid nanofluid with a dispersant content of 3.0 wt% had the best stability. Both temperature and concentration were important factors that affect thermal conductivity. The thermal conductivity increased more significantly with the temperature increasing. At the same time, nanoparticles would not only increase the thermal conductivity of the fluid but also greatly increase the viscosity of the heat transfer oil. Through data analysis, a certain amount of SiC and MWCNT nanoparticles could make the heat transfer oil have better thermophysical properties. The thermal conductivity of the SiC-MWCNT/Oil hybrid nanofluid with a concentration of 1.00 vol% was increased by 22.58% at 80 °C. SiC-MWCNT/Oil hybrid nanofluids have great application potential.