Today we will learn about types of fluid. We know that a substance, which has no fixed shape and able to flow easily in known as fluid.
Liquid and gases are considered in this category. There are various fluids according to their
properties and behavior in same atmospheric condition. These are:
Also Read : Properties of Fluids
Types of fluids:
Fluids can be classified as:
Ideal fluid:
A fluid, which is incompressible and having no viscosity,
is known as an ideal fluid. Ideal fluid is only an imaginary fluid as all the
fluids, which exist, have some viscosity.
Real fluid:
A fluid, which possesses viscosity, is known as real fluid.
All the fluids, in actual practice, are real fluids.
Example : Water, Air etc.
Newtonian fluid:
A real fluid, in which shear stress in directly proportional
to the rate of shear strain or velocity gradient, is known as a Newtonian
fluid.
Example : Water, Benzine etc.
Non Newtonian fluid:
A real fluid, in which shear stress in not directly
proportional to the rate of shear strain or velocity gradient, is known as a
Non Newtonian fluid.
Example : Plaster, Slurries, Pastes etc.
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 or velocity
gradient, is known as ideal plastic fluid.
Incompressible fluid:
A fluid, in which the density of fluid does not change which
change in external force or pressure, is known as incompressible fluid. All
liquid are considered in this category.
Compressible fluid:
A fluid, in which the density of fluid changes while change
in external force or pressure, is known as compressible fluid. All gases are
considered in this category.
Graphical representation of different fluids:
Tabular representation of fluid types:
Types of fluid

Density

Viscosity

Ideal fluid

Constant

Zero

Real fluid

Variable

Non zero

Newtonian fluid

Constant/ Variable

T = u(du/dy)

Non Newtonian fluid

Constant/ Variable

T ≠
u(du/dy)

Incompressible fluid

Constant

Non zero/zero

Compressible fluid

Variable

Non zero/zero

Today we have learned about types of fluids. If you have any
query regarding this article, ask by commenting.
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