Stability and Thermo-Physical Properties of Ethylene Glycol Based Nanofluids for Solar Thermal Applications

This article summarizes research involving the evaluation of thermo-physical properties ethylene- glycol-based solar thermic fluids oxidized multi-walled carbon nanotubes. Nanofluids were prepared with Ethylene glycol and water as base in 100:0, 90:10 80:20 ratios. Base three categories dispersed surfactant-assisted nanotubes (MWCNTs) MWCNTs weight fractions 0.125, 0.25, 0.5 percentages to check influence surface modification technique on thermophysical properties. The variation zeta potential is studied examine dispersion stability during 2 months. Thermal conductivity dynamic viscosity measured by hot disk method Anton paar viscometer, respectively. Significant enhancement thermal 15 24 % was observed when are MWCNTs. In case nanofluids MWCNTs, improvement significantly less compared Nanofluids' found be higher temperature range 50 70 oC. A comprehensive mathematical equation suitable for all fraction volume developed, which can forecast range. correlation could fit well experimental data reasonable limits.