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United States Department of Agriculture

Agricultural Research Service

Research Project: BIO-BASED LUBRICANTS FROM FARM-BASED RAW MATERIALS

Location: Bio-oils Research Unit

Title: Elastohydrodynamics of oil-soluble PAGs, high-oleic sunflower oil and their blends

Authors
item Bantchev, Grigor
item Biresaw, Girma

Submitted to: Society of Tribologists and Lubrication Engineers
Publication Type: Abstract Only
Publication Acceptance Date: December 27, 2012
Publication Date: May 13, 2013
Citation: Bantchev, G.B., Biresaw, G. 2013. Elastohydrodynamics of oil-soluble PAGs, high-oleic sunflower oil and their blends [abstract]. Society of Tribologists and Lubrication Engineers. p. 68.

Technical Abstract: Recent reports indicate that the oxidative stability of vegetable oils can be improved for lubrication purposes by mixing them with oil-soluble polyalkyl glycols (OS-PAG). This inspired a study of other lubrication-related properties of their blends. The viscosity, density, and elastohydrodynamic film thicknesses of OS-PAG, high oleic sunflower oil (HOSuO), and their 50/50 (wt.%) blends were investigated. The viscosity and density of the blends were found to be predictable from the corresponding neat oil properties using simple mixing rules. Pressure-viscosity coefficients (PVC) of HOSuO, the two OS-PAGs, and the two 50 wt% HOSuO/50 wt% PAG blends were calculated from measured film thickness data using the Hamrock-Dowson method and compared to values estimated from literature data. Literature pressure-density and viscosity temperature data for oils with high-oleic acid group content were analyzed using the Tait and Casalini et al. models. Viscosity vs. pressure data obtained from these analyses was used to calculate PVC using the Barus and Bair et al. models. The PVC values calculated from the literature data following this procedure showed reasonable agreement with that from film thickness data from this work.

Last Modified: 7/23/2014
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