Determination Of Liquid Dynamic Viscosity Coefficient Flashcards
Viscosity
A measure of the frictional forces which oppose the flow in a fluid
Ideal fluid
If a fluid is non viscous and incompressible and its velocity is the same at every point inside the tube
Real fluid
Fluid that has viscosity and it’s velocity varies with location
Laminar flow
Type of fluid flow characterised by smooth, orderly movement of fluid particles in parallel layers or streams
Turbulent flow
Type of fluid flow which is characterised by irregular and chaotic movement of fluid particles
Viscous friction
When the relative motion between the fluid layers is opposed by a frictional force
Velocity Gradient
Shows how much the fluid velocity changes per unit length in a direction perpendicular to the flow direction
Shearing forces
Unaligned forces pushing one part of a body in one direction, and another part of it in the opposite direction
Shear stress
The shear force divided by the area of the surface on which the force is applied
Newton’s law of viscosity
Describes the relationship between the sheer stress applied to a fluid and the velocity gradient
Dynamic viscosity
A measure of a fluids resistance to flow and it is defined as the tangential force per unit area required to maintain a difference in velocities of 1 m/s between two parallel layers of liquid 1m apart
Kinematic viscosity
The ratio of the viscosity of a fluid to it’s density
Fluidity
The reciprocal of dynamic viscosity
Newtonian fluid
If the viscosity of the fluid is independent of the shear rate
Non-newtonian fluid
If the viscosity of the fluid is dependent of the shear rate
