Dynamic Viscosity of Some Lubricants in Terms of Local Nano-Void Fraction |
| F. Sahin-Dinc
Machinery Department, Machinery and Metal Technologies, Surmene Abdullah Kanca Vocational School, Karadeniz Technical University, 61530, Camburnu, Surmene, Trabzon, Turkey |
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| In the current study, the dynamic viscosity has been established by the preceding viscosity correlation equation in terms of thermo-occupancy function, Yh=Yh(h,T), for three types of chemically different pure substances between 283.15-398.15 K and up to 100 MPa. The thermo-occupancy function, Yh=Yh(h,T), comprises temperature T and hole (nano-void) fraction h=h(P,T) estimated by the Simha-Somcynsky equation of state through the published density data. The density fitting results were found by this report to be from 0.026 to 0.051%. The predictive dynamic viscosity of dialkyl carbonates, ethylene glycol dimethyl ethers, and di(2-ethylhexyl) sebacate was obtained with an overall uncertainty of 0.29%, 0.40%, and 0.38%, respectively. The effects of the optimized volumetric and rheological parameters on the compounds' molecular structure and architecture were investigated. The increase in fraction h with an increasing temperature suggests a decrease in the rate of change in dynamic viscosity (viscoholibility) of the samples over a computed hole fraction range. |
DOI:10.12693/APhysPolA.144.180 topics: dynamic viscosity, dialkyl carbonates, glymes, di(2-ethylhexyl) sebacate |