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An experimental report and new correlation for estimating the dynamic viscosity of MWCNT(50)-ZnO(50)/SAE 50 as nano-lubricant

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Abstract

In this study, the viscosity of SAE 50 engine oil containing MWCNT-ZnO nanoparticles was investigated experimentally. For this purpose, volume fractions (VFs) of 0.0625–1% of nano-oil were prepared and their dynamic viscosity was measured at different temperatures of 25–50 °C with changing shear rate (SR) and its rheological behavior was studied. The investigations showed the dependency of viscosity to SR variation, which is a sign for non-Newtonian behavior of nano-fluid (NF). The results clearly showed that pure oil and nano-oil behave non-Newtonian and behave similar to non-Newtonian shear-thinning fluids. To prevent spending extra money in future studies a new mathematical based correlation is proposed with the accuracy of R2 = 0.9984. By doing a comparisons between predicted resutls by the correlation and experimental results a proper accuracy in the mentioned temperature and concentration ranges was obtained.

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Abbreviations

\(\dot{\gamma }\left( {s^{ - 1} } \right)\) :

Shear rate

Τ (Pa):

Shear stress

T (℃):

Temperature

φ (%):

Volume fraction

μ (m2 s−1):

Viscosity

ρ(kg m−3):

Density of the fluid

SR:

Shear rate

NFs:

Nano-fluids

BFs:

Base fluids

NPs:

Nanoparticles

NF:

Nano-fluid

VF:

Volume fraction

R 2 :

Coefficient of determination

SS:

Shear stress

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  1. Department of Mechanical Engineering, Imam Hossein University, College of Engineering, Tehran, Iran

    Mohammad Hemmat Esfe

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Correspondence to Mohammad Hemmat Esfe.

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Hemmat Esfe, M. An experimental report and new correlation for estimating the dynamic viscosity of MWCNT(50)-ZnO(50)/SAE 50 as nano-lubricant. J Therm Anal Calorim 143, 1107–1117 (2021). https://doi.org/10.1007/s10973-020-09731-7

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