(2) Kinematic Viscosity: The ratio of dynamic viscosity to density appears frequently and this ratio is given by the name kinematic viscosity. What is the SI unit of kinematic viscosity and dynamic viscosity?Ī common unit of dynamic viscosity is poise. The SI unit for dynamic viscosity η is the Pascal-second (Pa-s), which corresponds to the force (N) per unit area (m2) divided by the rate of shear (s-1). The most commonly used unit for dynamic viscosity is the CGS unit centipoise (cP), which is equivalent to 0.01 Poise (P). The SI unit of viscosity is poiseiulle (Pl). Kinematic viscosity is represented dimensionally as. Kinematic viscosity (ν) = Dynamic viscosity × -1 When we substitute equations (2) and (6) into equation (1), we get When we substitute equations (4) and (5) into equation (3), we getĭynamic viscosity (η) = × × -1 × -1 =.
The area and velocity dimensional formula = L 2 and L 1 T -1. (2)ĭynamic viscosity (η) = Tangential Force × distance between layers × -1. Kinematic viscosity (ν) = Dynamic viscosity × -1. Kinematic Viscosity’s dimensional formula is given by, The kinematic viscosity formula is as follows: ν = μ/ρ Dimensional Formula of Kinematic Viscosity It is the time area ratio henceforth, it is m22/s or ft22/s. It is the ratio of dynamic viscosity to density, which is a force-independent quantity. Kinematic viscosity units are based on time and area. Momentum diffusivity is a term that is used from time to time. Kinematic viscosity is calculated by dividing the fluid mass density by the dynamic fluid, viscosity, or absolute fluid viscosity. Viscosity is a concept that describes the struggle of fluid against a flowing that is distorted due to extensional stress forces or shear stress. One stoke equals one centimetre squared per second. The centimetre-gram-second (CGS) system’s unit of kinematic viscosity, known as the stokes in the United Kingdom and the stoke in the United States, is named after British physicist Sir George Gabriel Stokes. Kinematic viscosity is defined as area divided by time the appropriate units are metre squared per second. The absolute viscosity of a fluid is divided by its mass density to get kinematic viscosity. In some cases, kinematic viscosity is more valuable than absolute or dynamic viscosity. As a result, the unit of viscosity is newton-second per square metre, which is usually expressed in SI units as pascal-second. Dynamic viscosity has the dimensions force-time area. Fluids that behave in this manner are known as Newtonian fluids, after Sir Isaac Newton, who first developed this mathematical description of viscosity. The dynamic, or absolute, viscosity, or simply the viscosity, is the name given to this constant. In other words, the shear stress divided by the rate of shear strain is constant for a given fluid at a set temperature. The rate of shear strain, or rate of deformation, is precisely related to the tangential, or shearing, stress that generates flow in many fluids.
It regulates liquid flow in processes such as spraying, injection moulding, and surface coating. Viscosity is a crucial component in determining the forces that must be overcome when fluids are employed in lubrication and transferred in pipes. Internal friction between molecules can be thought of as viscosity this friction opposes the development of velocity differences within a fluid since a section of a fluid that is compelled to move carries along nearby parts to some extent. The viscosity of molasses, for example, is higher than that of water. Fluidity is a measure of how easily a substance flows and is defined as the reciprocal of viscosity. The resistance of a fluid (liquid or gas) to a change in shape or movement of neighbouring portions relative to one another is referred to as viscosity.
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