μ = dynamic viscosity of fluid (N s/m 2).Mathematically, dynamic viscosity can be expressed as:ĭynamic viscosity is especially useful when describing non-Newtonian fluids. The SI unit for dynamic viscosity is N s/m 2 or the Pascal-second (Pa s). Another unit of measurement for dynamic viscosity is poise (p), where one poise equals one-teneth N s/m 2 or 1/10 Pa s. The poise unit can sometimes be too large for practical purposes. Viscous materials, like water, resist shear flow and strain linearly with time when a stress is applied. Creep-recovery tests have been used widely in other industries such as. In materials science and continuum mechanics, viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation. For this reason, centipoise (cP) unit is often used in its place. For hydraulic fracturing fluids, low shear viscosity has also received much attention9. In the centipoise unit, one cP equals 0.01P, 0.001 N s/m 2 or 0.001 Pa s. Kinematic viscosity is simply the ratio of the dynamic viscosity to the fluid's density. It reflects a fluid’s resistance to shear flow under the influence of gravity, i.e., shear flow due to the fluid’s own weight. μ = absolute or dynamic viscosity (N s/m 2).Mathematically, kinematic viscosity can be expressed as: This viscosity is especially useful in describing Newtonian fluids. The SI unit for dynamic viscosity is m 2/s. Another unit of measurement for this property is Stoke (St), where one St equals 10 -4 m 2/s equals 1 cm 2/s. Where the viscosity value in Stoke is too large, the smaller unit centistoke (cSt) is often used in its place. In the centistoke, one cSt equals 10 -6 m 2/s = 1 mm 2/s.
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