Location: Bio-oils Research Unit
Title: The pressure viscosity coefficient of polar and non-polar oils Authors
Submitted to: Society of Tribologists and Lubrication Engineers
Publication Type: Abstract Only
Publication Acceptance Date: December 15, 2011
Publication Date: May 6, 2012
Citation: Biresaw, G., Bantchev, G.B. 2012. The pressure viscosity coefficient of polar and non-polar oils [abstract]. Society of Tribologists and Lubrication Engineers Annual Meeting & Expo. p. 134. Technical Abstract: The pressure viscosity coefficient (PVC) of several vegetable, polyalphaolefin (PAO), and hexadecane oils were investigated. Vegetable oils are polar because they have multiple ester functional groups in their structure. On the other hand, the petroleum based PAO and hexadecane have no functional groups and are, thus, non-polar. PVC was estimated using the So and Klaus (S-K) procedure from oil viscosity and density, the Hammrock-Dowson (H-D) relationship from analysis of EHD film thickness, and the Barus equation from EHD traction and film thickness data. Measured PVC of all the oils decreased with increasing temperature and pressure. PVC values from the S-K method were generally much higher than the values from the literature or from the other two methods. PVC values from the S-K and H-D methods increased with increasing viscosity of the tested oils, but no such correlation was observed with the PVC data from the Barus method. The effect of oil chemical structure on PVC values from these three methods are discussed.