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Classification of fluids | basic of fluid Mechanics

CLASSIFICATION OF FLUIDS

1) Ideal fluid :
This fluid is incompressible and possesses no viscosity. Such a fluid is only an imaginary fluid. All existing fluids have some viscosity.

(ii) Real fluid :
A fluid that possesses viscosity is known as a real fluid. In actual practice, all fluids are real fluids.

(iii) Newtonian fluids :
A real fluid in which the shear stress is directly proportional to the rate of shear strain (or velocity gradient) is called Newtonian fluid.

iv) Non-Newtonian fluids :
A real fluid in which the shear stress is not proportional to the rate of shear strain (or velocity gradient) is called non-Newtonian fluid.

v) Ideal plastic fluid :
A fluid in which the shear stress is more than the yield value and the shear stress is proportional to the rate of shear strain (or velocity gradient) is called ideal plastic fluid.

classification of fluid graph
Fig. Classification of Fluids

CLASSIFICATION OF FLOWS ON THE BASIS OF MACH NUMBER.

1. Incompressible flow-M less than 0.3

2. Compressible subsonic flow-M between 0.3 and 1

3. Transonic flow-M ranging between values less than 1 and more than 1

4. Supersonic flow-M greater than 1 but less than 5

5. Hypersonic flow - M greater than 5

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