Types of fluid

The fluid may be classified into the following five types :

1. Ideal fluid
2. Real fluid
3. Newtonian fluid
4. Non-Newtonian fluid
5. Ideal plastic fluid

Ideal fluid :

Ideal fluid is a fluid which is incompressible and is having no viscosity.

Ideal fluid is only an imaginary fluid.

Real fluid :

The real fluid is a fluid which possesses viscosity.

All fluid is in actual practice is real fluid.

Newtonian fluid :

A real fluid, in which the shear stress is directly proportional to the rate of strain is known as a Newtonian fluid.

Non-Newtonian fluid :

A real fluid, in which the shear stress is not proportional to the rate of strain is known as a Newtonian fluid.

Ideal plastic fluid :

A fluid, in which shear stress is more than the yield value and shear stress is proportional to the rate of shear strain is known as ideal plastic fluid.