Thermal Conductivity Enhancement of Graphene Oxide Nanofluid Using an Improved Synthesis Method for Heat Transfer Applications

In this research work, graphene oxide (GO) nanomaterial was synthesized by using an improved synthesis method and deionized (DI) water is used as base fluid. The X-ray diffraction (XRD) analysis, Raman spectroscopy, scanning electron microscope (SEM) imaging, and Ultraviolet-visible (UV-Vis) spectroscopy were used to study characterization and morphology structure of GO. The three different nanofluid volumetric concentrations of 0.001%, 0.002% and 0.003% were prepared and the stability of nanofluid samples was evaluated by the zeta potential analysis method. The zeta potential analysis results revealed that the prepared nanofluid samples were stable for up to 30 days with no obvious sedimentation. This study experimentally investigates the effects of temperature variation and different nanofluid samples on the thermal conductivity GO/DI nanofluid. The findings of experimental study demonstrated that the thermal conductivity of GO/DI nanofluid increases with increase in the temperature and nanofluid concentrations. The maximum increment in thermal conductivity of nanofluid was obtained to be 25.15% at 40 0 C for 0.003% volumetric concentration as compared to water.