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Rheological behavior characteristics of MWCNT-TiO2/EG (40%–60%) hybrid nanofluid affected by temperature, concentration, and shear rate: An experimental and statistical study and a neural network simulating

Highlights•Investigating rheological behavior of MWCNT-TiO2 /EG by neural network simulating.•The viscosity with various contents of the particles, is measured Experimentaly.•Applying an equation, correlating viscosity to the temperature and solid particles.AbstractRheological behavior of high-viscous fluids, is of crucial importance in design, function and efficient lifetime of thermal-fluid and mechanical-fluid systems. In this work we create a new 3rd power equation, correlating the viscosity of a hybrid nanofluid to the operation temperature and the content of the solid particles. An Ethylene Glycol, 40%–60% Multiwall Carbon Nanotubes and Titanium dioxide MWCNT-TiO2/EG, hybrid fluid is tested as the model component. The viscosity of the hybrid fluid with various contents of the solid particles, is measured systematically in 25-50 °C, and fit an equation with the R2 of 0.9327. It was inferred that the volume fraction of the solid particles profoundly alters the rheological behavior of the nanofluid. To elaborate, in a low content of the solid particles, the rheological trait of the hybrid fluid follows a Newtonian model, as linearly changes with shear rate. Whilst, with a high content of solid particles the rheological trait of the hybrid fluid shifts to a non-Newtonian regime. Current study offers an easy and reliable theory, obtained from systematic data, which guarantees a precise prediction on rheological behavior of the MWCNT-TiO2/EG with various volume fractions of solid particles, and in various operating temperatures.Graphical abstractDownload : Download high-res image (151KB)Download : Download full-size image

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