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on to fluids, we’ll give the definition of the coefficient of viscosity for liquids and gases, give some values for different fluids and temperatures, and demonstrate how the microscopic picture can give at least a qualitative understanding of how these values vary: for example, on raising the temperature, the viscosity of liquids decreases
The property of a fluid to resist the growth of shear deformation is called viscosity. The form of the relation between shear stress and rate of strain depends on a fluid, and most common fluids obey Newton’s law of viscosity, which states that the shear stress is proportional to the strain rate: dγ τ = μ. . dt.
Definitions • viscosity (dynamic viscosity, absolute viscosity): a fluid’s resistance to deformation from shear stress • no-slip condition: fluid particles in contact with a solid boundary have the same velocity as the boundary
definitions. Informally, viscosity is the quantity that describes a fluid's resistance to flow. Fluids resist the relative motion of immersed objects through them as well as to the motion of layers with differing velocities within them. (dynamic) viscosity.
DEFINITION: Viscosity can be defined as the property of any fluid that determines its resistance to motion, against a containing surface or against adjacent increments of itself.
fluid flow. solid surface. The magnitude of the drag force on a fluid is characterized by its viscosity η. Demo: The effects of dissipation show up as a pressure gradient at constant height y. direction of flow. Within a tube, there is a velocity gradient in the presence of viscosity: no viscosity. with viscosity.
3.1 DEFINITION AND MEASUREMENT OF VISCOSITY The behavior of a fluid in flow is very much related to two intrinsic properties of the fluid: density and viscosity. For example, a solid body moving through a gas has to overcome a certain resistance which depends on the relative velocity between fluid and solid, the shape of the solid, the
