As fluid complexity increases, for example by the inclusion of bubbles, droplets, particles or polymers, fluids may take on more complex behavior and show a Non-Newtonian A non-Newtonian fluid is one that exhibits a viscosity that varies as a function of the applied shear rate or shear stress.non-Newtonian response, where viscosity depends on the amount of applied shear. Examples would be water and simple hydrocarbons.
Many simple fluids are classed as Newtonian meaning their viscosity is independent of the amount of shear applied. A material with a surface area of A and height of h, will deform with a deflection of x when a constant force F is applied to the top surface. The most common flow behavior is shear flow. In shear flow, fluid components shear past one another while in extensional flow, fluid components flow away or towards one other. There are two basic types of flow, these being shear flow and extensional flow.
Viscosity is the resistance of a material to flow.
