Fluid
- A fluid is a substance which
deforms continuously under the application of shear force no matter how small the shear stress may be.
- The fluid does not have a definite shape
of its own, but conforms to the shape of the containing vessel
- Liquid and gases or vapors are
considered as fluid.
Ideal fluid
- It is a fluid which does not offer
resistance to flow or to change shape and the resulting motion is
called as ideal or inviscid flow
- Hence it does not has
viscosity ( μ = 0).
- It is frictionless and
incompressible.
- But the ideal fluid is an imaginary
fluid, it does not exist in nature.
Real fluid
- It is a fluid which offers
resistance when it is set in motion and their motion is known as viscous
flow.
- All naturally occurring fluids are
real fluids.
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