Thermal Transport Phenomena of Graphene Oxide Nanofluids in Turbulent Pipe Flow

抄録

The aim of the present study is to investigate the thermal fluid flow transport phenomenon of graphene oxide (GO) nanofluids in the heated horizontal stainless steel circular tube that was subjected to a uniform heat flux at its outer surface. The heat transfer and the pressure drop within flowing base fluid (pure water) were measured and compared with the corresponding data from the correlations. Consideration is given to the effects of volume fraction of the nanoparticle on the thermal conductivity, viscosity, and zeta potential. Graphene oxide (GO) nanoparticles were synthesized by the modified Hummers method. The convective heat transfer performance results show that the dispersed nanoparticles can always enhance the heat transfer coefficient of the base fluid, and the highest enhancement was obtained to be 181 % in the concentration of 0.2 vol.% of GO nanoparticles with Reynolds number 3000. The thermal conductivity enhancement depends strongly on the concentration of GO particles and increases with the increasing loading. It was also shown that the viscosity and pressure drop increase in accordance with an increase of the volume fraction.