Unformatted text preview: This is the ratio of the dynamic viscosity and the fluid density ρ ( kg / m 3 ). The SI unit of kinematic viscosity is the m 2 / s. The equivalent cgs unit is the stoke (St) which has the unit of cm 2 / s. The unit commonly used is the centistoke(cSt). 1 m 2 / s = 10 6 cSt Absolute Kinematic Viscosity (m 2 / s ) = µ ( Pa s ) / ρ (kg / m 3 ) Kinematic viscosity (centiStokes) = µ (centiPoise) / ρ ( grams /cubic cm ) Saybolt Universal Viscosity A method of determining a lubrication fluids viscosity is to measure the rate of flow of the fluid through a test device. The rate is measured in seconds the greater the number of seconds the more viscous the fluid. This viscosity is seconds τ = Saybolt universal Viscosity  seconds. The dynamic viscosity relates to the Saybolt universal viscosity ( τ ) by the following formula Viscosity µ (Poise) = (0.00022 . τ — 0.18 / τ )...
View
Full Document
 Fall '07
 EISCHEN
 Shear, Stress, kinematic viscosity, dynamic viscosity, saybolt universal viscosity, cP Kinematic Viscosity

Click to edit the document details