Voluminosity of Soot Aggregates: A Means of Characterizing Soot-Laden Oils Chevron Research and Technology Company Richmond, California

Format:

Conference/Event

Author/Creator:

Ryason, P. R., author.

Conference Name:

International Fuels and Lubricants Meeting and Exposition (1991-10-07 : Toronto, Canada)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1991

Summary:

"Oil thickening" due to soot has long been recognized as a potential problem in diesel engine lubrication. Soot-related viscosity increase in used crankcase oils is remarkable in that relatively small concentrations of soot produce large viscosity increases. Classical studies of suspensions of rigid nonagglomerating spheres in liquids suggest that the viscosity increase produced by 6% (by weight) soot in an oil should be less than 10%. In fact, the viscosity increase in such a mixture may be as much as several hundred percent. This discrepancy implies that the effective volume occupied by soot particles suspended in oil is very large. Past theoretical and experimental work on the rheology of particle suspensions provides a method of quantitatively determining the effective volumes ("voluminosities") of soots in oil suspensions. Three different used oils were characterized by controlled shear rate rheometry. Quantitative voluminosities permit the reliable companion of the efficacies of different oils to control soot-related viscosity increase. Mechanisms are speculated upon by which soots exhibit very high effective volumes in suspensions

Notes:

Vendor supplied data

Publisher Number:

912343

Access Restriction:

Restricted for use by site license