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Likewise kinematic viscosity also involves the magnitudes of length and rime only. The name kinematic viscosity has been given to the ratio (µ/p) because kinematics is defined as the study of motion without regard to the cause of motion and it concerned with length and time only. The kinematic viscosity ( v) viscosity is defined as the ratio of dynamic viscosity to mass density. Dynamic Viscosity (μ):Īs explained earlier, the dynamic viscosity (μ) is defined as the shear stress required causing unit rate of shear deformation. Its unit can be derived asĭu/dy – is the rate of shear deformation or rate of shear strain. Μ (Mu) is the constant of proportionality or co-efficient of dynamic viscosity or Viscosity Unit. A fluid layer at a distance of y from surface moves with a velocity of `u’ and a layer at a distance of dy from y moves with a velocity of u+du.Īccording to Newton’s law of viscosity the shear force, F acting between two layers of fluid is proportional to difference in their velocities du and area A of the plate and inversely proportional to the distance dy between them. The plate moves with a velocity U by a force F as shown in fig 1.2. The space in between is filled with a fluid. Viscosity increases with increase in temperature in case of gases whereas it decreases in case of liquid.Ĭonsider, a plate is placed at a distance of ‘Y’ from the fixed surface. Viscosity can also be defined as the property of a fluid due to which it offers resistance to the movement of one layer of fluid over another adjacent layer.