Heat Transfer Enhancement of Car Radiator by Various Nano Fluids

Nanofluids often exhibit significantly higher thermal conductivity compared to the base fluid. It has been shown by earlier researchers that heat exchange between a heat source and nanoparticles, which frequently collide with the heat source, significantly contributes to the enhancement of the thermal conductivity. Contributions of heat exchange between a heat source and colliding nanoparticles to enhanced thermal conductivity have been investigated for the first time, through multi-scale modeling. A colloidal mixture of nano-sized (<100 nm) particles in a base liquid called nanofluid, which is the new generation of heat transfer fluid for various heat transfer applications where transport characteristics are substantially higher than the base liquid. In the present study, the effects due to temperature and concentration on thermophysical properties (thermal conductivity, viscosity and density) for Al2O3, ZnO, TiO2, CuO, Ethylene Glycol based nanofluids are experimentally investigated.