It has often been noted that the nanofluids improved heat transfer than conventional coolants however, it cannot be conclusively said that the general hydrothermal efficiency of nanofluids is better than base fluids. Also, the cooling performance of these nanofluids in various applications has been investigated both experimentally and numerically. So far, many nanofluids have been synthesized, and their thermophysical properties have been measured. Nanofluids are composed of nanoparticles (NPs) suspended in base fluids, and in fact, the appearance of NPs with a high heat transfer rate has improved the cooling performance of nanofluids. Nanofluids are modern coolants that have been introduced as an alternative to conventional heat transfer fluids and have earned plenty of recognition because of their remarkable thermal characteristics. Finally, the simple and reliable equations that can predict the rheological behavior of graphene/water nanofluid are calculated. Besides, to determine the viscosity of nanofluid in varied temperatures and mass concentrations, an artificial neural network via R 2 = 0.999 was applied. Results showed that nanofluid has non-Newtonian nature, the same as the power-law form. Moreover, nanofluid stability was examined via zeta-potential measurement. Transmission electron microscopy and field emission scanning electron microscopy were also employed for micro and nano structural-study. Fourier transform infrared spectroscopy, dynamic light scattering, energy-dispersive X-ray spectroscopy, and X-ray powder diffraction were used for analyzing the phase and structure. In this research, the rheological nature of graphene/aqueous nanofluid was examined. In carbon-based materials, due to their extensive use in industry, finding the simple and reliable equations that can predict the rheological behavior is essential. Viscosity shifts the flow features of a liquid and affects the consistency of a product, which is a primary factor in demonstrating forces that should be overcome when fluids are transported in pipelines or employed in lubrication.
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