Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 242, Issue -, Pages 326-335Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2017.06.075
Keywords
Hybrid nano-lubricants; CuO-MWCNT; Bingham behavior; Non-Newtonian; New correlation; DVE
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In this study, we examined the rheological behavior of hybrid nano-lubricant CuO-MWCNT (85%-15%)/10W-40 at the temperature range of 5 to 55 degrees C and the solid volume fraction of 0.05 to 1% to use in internal combustion engines. According to experimental data, by increasing the solid volume fraction, the amount of nano-lubricant viscosity increases compared with pure lubricant, so that the maximum amount of dynamic viscosity enhancement in solid volume fraction of 1% is about 43.52%. Nano-lubricant behavior is diagnosed by using the Herschel-Bulkley (type Bingham) model, so that in temperatures <45 degrees C, nano-lubricant shows non-Newtonian behavior of Bingham pseudoplastic, and it shows Bingham plastic non-Newtonian behavior at temperatures above 45 degrees C. Finally, to predict the dynamic viscosity of nano-lubricant, a mathematical correlation with second order precision of 0.9846 was presented, which it had acceptable match with experimental data. (C) 2017 Elsevier B.V. All rights reserved.
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