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A proposed pressure-viscosity coefficient model through processing of falling body viscometry data for di-(ethylhexyl) sebacate


 The relative volume and falling body viscosity of a common high-pressure rheology reference lubricant, di-(ethylhexyl) sebacate (DEHS), are presented. Relative volume measurements up to 300MPa are completed with a piezo-bellows relative volume cartridge. Viscosity measurements up to 1GPa are completed with a pressurized falling body viscometer. Digital signal processing routines used for viscosity and relative volume measurements are discussed. The viscosity data is then fit to the modified Yasutomi model. Integration of this fit, as well as that of other models found in the literature, is used to propose a pressure-viscosity coefficient model. Comparisons are first made to DEHS, followed by application of the study results to 17 other well-documented fluids. The validity of this method is investigated using the integrated viscosity model of DEHS as well as other available datasets presented in literature. The authors perform a comparison between the calculated asymptotic isoviscous pressure-viscosity coefficient a* and those presented for the mentioned datasets created with the signal processing routines. Analysis shows that the proposed pressure-viscosity coefficient model is able to accurately capture the asymptotic isoviscous pressure response of the majority of data when compared to other calculation methods.