Investigation of Pool Boiling Heat Transfer Characteristics of Graphene-Water Nanofluids

Abstract

In this study, pool boiling heat transfer characteristics of Graphene-water nanofluids are reported. Graphene-water nanofluid of 0.05% and 0.1% concentration are prepared. The pool boiling experiments are conducted with Nichrome wire as the heater surface. The fundamental heat transfer characteristics for designing heat transfer devices such as Critical Heat Flux, Boiling Heat Transfer Coefficient and Wire Temperature are observed for the both concentrations of nanofluids, and the variation of these characteristics with different volume concentration are plotted. At the end of the Boiling Experiment, it was observed that the Critical Heat Flux showed an increasing trend with increase in nanoparticle concentration with a maximum enhancement of 28.04% compared to DI water. The Boiling Heat Transfer Coefficient also displayed an increasing trend with increase in nanoparticle concentration with a maximum enhancement of 65.74% compared to DI water. The Wire Temperature showed a decreasing trend with increase in nanoparticle concentration with a decrement of 47.2% compared to DI water. The burnout wire is observed under a Scanning Electron Microscope and the accumulation of Graphene nanoparticles on the Nichrome wire surface has been validated with the help of SEM and EDS data.