Since every fluid is different, the reaction to the same temperature is different which gives the viscosity index its significance. The same fluid can have a different viscosity at a different temperature, so it makes sense to specify the temperature while mentioning a fluid's viscosity. , The viscosity of a lubricant is closely related to its ability to reduce friction in solid body contacts. It is mostly used to characterize the viscosity-temperature behavior of lubricating oils. - Definition, Angle & Coefficient, What is Specific Volume? Saran has had significant consulting exposure with a Bachelors degree in Mechanical Engineering. 0000001186 00000 n vi, H = kinematic viscosity in centistokes at 40°C of an oil of 100 viscosity index, and having the same kinematic viscosity at 100°C as the oil whose viscosity index is to be calculated. Anyone can earn 102-107. Only emails and answers are saved in our archive. Like this book? This publication is intended to replace the previous Viscosity IndexTables: DS 39a. - Definition, Formula & Units, Precipitation Hardening: Definition & Process, Martensite: Definition, Transformation & Microstructure, Modulus of Rigidity: Definition & Equation, Yield Point: Definition, Curve & Elongation, What is an Alloy? 0000129520 00000 n (It also applies to fluids like engine and automatic transmission oils, gear lubricants, and power-steering fluids.) The viscosity index for a fluid is better understood as the ability to protect its viscosity from temperature changes, so it follows that a high VI oil shows a greater resistance to viscosity change and should be used to counter-balance the effects that temperature would have had on a lower VI oil. May 1975 February 1986 Second Printing January 1990 Third Printing November 1996 Fourth Printing, Foreword These tables were prepared to provide a convenient means of obtainingthe viscosity index of petroleum products and lubricants without the neces-sity of calculation. | Common Core Math & ELA Standards, Philosophy 103: Ethics - Theory & Practice, Introduction to Computing: Certificate Program, First Contacts in the Americas: Help and Review, Quiz & Worksheet - Single-Displacement Reactions, Quiz & Worksheet - Presidential Election of 1828, Quiz & Worksheet - Predicting Molecular Shape, Quiz & Worksheet - Overpopulation vs. Overconsumption. The SAE weight system has a very broad and vague viscosity range and does not even cover the viscosity range that most quality motorcycle suspension systems require. This deviation can arise from the rounding procedure usedby the computer when producing the tables. 0 Selecting the right lubricant for protecting your car's engine depends largely on the fluid's viscosity index. Thus the issue of multigrade oils came into being, where with variable temperatures of, say, minus -10*C during the cold nights and 20*C during the days, a 5 weight oil would be good as the oil would be pumpable in a cold engine and as the engine came up to running temperature, and the day warmed up, the characteristics of a 30 weight oil would be ideal. Thus the 5W-30W or 5-30W oils were introduced, rather than the fixed and temperature limiting grades — where the thin oils became too thin when hot and the thicker oils became too thick when cold. Dynamic, Absolute and Kinematic Viscosity, en: dynamic viscosity ssu centistokes stokes poise centipoise, es: centistokes ssu viscosidad dinÃ¡mica Stokes centipoises aplomo, de: dynamische ViskositÃ¤t ssu Centistokes schÃ¼rt Poise Centipoise. You already know this, but by a different name - stickiness. %PDF-1.4 %���� If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords.
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