The apparent viscosity of a dilatant fluid is higher when measured at a higher shear rate ( η 4 is higher than η 3), while the apparent viscosity of a Bingham plastic is lower ( η 2 is lower than η 1). The apparent viscosity of a fluid depends on the shear rate at which it is measured. To obtain the kinematic viscosity from the absolute viscosity, the latter is divided by the density of the liquid at the same temperature, i.e., kinematic. Pascal is a unit of force just like horsepower. JSTOR ( March 2009) ( Learn how and when to remove this template message) The formula for dynamic or absolute viscosity is 1 centipoise (cP) equals 1 millipascal-second (mPa-s).Unsourced material may be challenged and removed.įind sources: "Apparent viscosity" – news Please help improve this article by adding citations to reliable sources. The units of dynamic viscosity are Poise or Pa. Dynamic viscosity is the force needed by a fluid to overcome its internal molecular friction so that it can flow freely. They are related via the density of the medium, with. First, we differentiate between the kinematic and dynamic viscosities, referred to by symbols and or. This article needs additional citations for verification. There are several different types of viscosities that one may encounter in fluid dynamics. Measuring Dynamic Viscosity (Absolute Viscosity) Dynamic viscosity is measured as the resistance to flow when an external and controlled force (pump, pressurized air, etc.) forces oil through a capillary (ASTM D4624), or a body is forced through the fluid by an external and controlled force such as a spindle driven by a motor.
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