Experimental investigation of the rheological behavior of MgO(60%) MWCNT(40%) hybrid nanofluid in 10W40 oil base fluid

Document Type : Research Paper

Authors

1 Associate Professor, Department of Mechanical Engineering, Faculty of Technology and Engineering, Imam Hossein University (AS), Tehran, Iran

2 Master's student in Mechanical Engineering, Faculty of Civil, Water and Energy, Imam Hossein University (AS)

Abstract

In this research, the rheological behavior of MgO(60%) MWCNT(40%) hybrid nanofluid in 10W40 oil base fluid has been investigated using experimental method. The nanofluid used in this research was prepared by a two-step method to measure the viscosity of the nanofluid using a CAP 2000+ viscometer, and TEM, SEM and XRD analysis methods were used to identify and confirm the structure and morphology of the nanoparticles. The viscosity of the nanofluid was studied in the temperature range of 5 to 55 degrees Celsius (in 6 temperatures) and in the volume fraction range of 0% to 1% (in 7 volume fractions) and the effect of both parameters (temperature and solid volume fraction) ) along with changes in shear rate in the range of (1/s) 666.5 to (1/s) 11997 have been investigated on changes in the viscosity of nanofluid. The experimental results showed that the viscosity of the hybrid nanofluid in the volume fraction of 1% and the temperature range of 5-35 ℃ at a constant shear rate of 3999 s-1 is 17.37% higher compared to the viscosity of pure oil. Also at a constant shear rate of 6665 s-1 and in a temperature range of 15-55 ℃, the dynamic viscosity of the hybrid nanofluid is 15.98% higher than the viscosity of the base oil. Examining the rheological behavior of the hybrid nanofluid showed that the behavior of the nanofluid is non-Newtonian and pseudo-plastic.

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