The SI unit of dynamic viscosity is Pascal seconds. Dynamic viscosity is the general viscosity measurement used in most of the calculations. Dynamic viscosity is also known as the absolute viscosity. They are namely dynamic viscosity and kinematic viscosity. Viscosity equations and models are very complex for non-Newtonian fluids. The viscosity decreases as the temperature is increased. The viscosity of a fluid depends on the temperature. Viscosity of a fluid can also be measured by several experiments. The cgs system uses the unit “poise”, named after Jean Louis Marie Poiseuille, to measure viscosity. The units of viscosity are Pascal-seconds or Nm -2s. Viscosity of a fluid can be measured using Viscometers and Rheometers. The viscosity is usually denoted by the Greek letter “µ”.
The proportional constant (proportionality factor) used here is the viscosity of the fluid. He postulated that, for a Newtonian fluid, the shear stress between layers is proportional to the velocity gradient in the direction perpendicular to the layers. Sir Isaac Newton was a pioneer in fluid mechanics. Viscosity is simply the friction between two layers of a fluid when the two layers move relative to each other. It’s also referred as the thickness of a fluid. In more common words, viscosity is the “internal friction” of a fluid.
Viscosity is defined as a measure of the resistance of a fluid, which is being deformed by either shear stress or tensile stress.
In this article, we are going to discuss what viscosity and kinematic viscosity are, their definitions, the applications of viscosity and kinematic viscosity, the similarities and finally the differences between kinematic viscosity and viscosity. A good understanding in the concepts of viscosity and kinematic viscosity is required to excel in the above mentioned fields. Viscosity and kinematic viscosity have a variety of applications in fields such as fluid dynamics, fluid mechanics, aerodynamics, chemistry and even medical science.
Viscosity is a very important parameter discussed in fluid mechanics. Viscosity vs Kinematic Viscosity | Dynamic Viscosity, Absolute Viscosity
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