![]() Abstract reprinted with permission of SAE International.Find a library where document is available.1 For instance, when a viscous fluid is forced through a tube, it flows more quickly near the tube's axis than near its walls. Uses a Microgel thickener and high-viscosity-index synthetic base. 1 Viscosity quantifies the internal frictional force between adjacent layers of fluid that are in relative motion. The results confirmed that the low temperature emulsified oil properties were independent of the type of VII used in the formulation. With best-in-class performance across several aspects such as mechanical stability, water. Both fresh and used oil emulsions were tested in a Cold-Cranking Simulator, and Mini-Rotary Viscometer. This was in contrast to fresh oil behavior. When used field test oils were assessed for their emulsion characteristics with E85/water, the used oil emulsions formed a single emulsified phase. Analysis of the emulsion composition by Fourier Transform Infrared spectroscopy and Gel Permeation Chromatography confirmed ethanol and water were present in the emulsion phase, while the gasoline and other oil soluble components, including the VII, were present in both phases. None of the emulsions exhibited a separate water phase, regardless of the type of VII in the oil. It is influenced by several factors such as contamination with water, particles or other lubricants. Separate oil/gasoline and emulsion (ethanol/water/oil) phases were observed for fresh oil emulsions. Viscosity can be defined as an oil’s resistance to flow and shear. The emulsion properties were evaluated after storage for 24 hours at two different temperatures. Viscosity index indicates the change in fluid viscosity in dependence of temperature. Q: What is viscosity index A: Viscosity index of a fluid is a calculated number according to ASTM D2270 or ISO 2909. For example the viscosity of honey is higher than the water. Emulsions were prepared with fresh and used passenger car motor oils using the ASTM D7563 method for emulsion retention. High viscosity fluid has more resistance to flow than a low viscosity fluid. Different types of Viscosity Index Improver (VII) chemistries were evaluated for their effects on emulsion formation and engine oil characteristics. Notably, such concerns are about the effect of emulsion formation and stability in crankcase oils by E25 or E85 fuel and water dilution on vehicle operation at cold-start conditions. Effect of Viscosity Index Improvers in Ethanol/Gasoline/Water Emulsions Formed with E25 and E85 in Passenger Car Motor OilsĬoncern about the consequences of fuel dilution on engine oil properties are intensifying due to the increasing use of E25 and E85 fuel in passenger cars.
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