A non-Newtonian fluid is a fluid that does not follow Newton's law of viscosity, i.e., constant viscosity independent of stress. In non-Newtonian fluids, viscosity can change when under force to either more liquid or more solid. Ketchup, for example, becomes runnier when shaken and is thus a non-Newtonian fluid.

1. BIOMECHANICS
Newtonian and Non
Newtonian Fluid
Prepared by Atheena Pandian

2. TODAY'S
PRESENTATION
DISCUSSION OUTLINE
Newtonian Fluid
Non Newtonian Fluid
Newton's Law of Viscocity
Shear Stress
Newtonian Fluid Verses Non
Newtonian Fluid
1.
2.
3.
4.
5.

3. NEWTONIANFLUID
A Newtonian fluid is a fluid
that follow Newton's law of
viscosity

4. NONNEWTONIAN
FLUID
A non-Newtonian fluid is a
fluid that does not
follow Newton's law of
viscosity

5. NEWTON'S VISCOSITY
LAW
It states that, the shear stress
between adjacent fluid layers
is proportional to the velocity
gradients between the two
layers.

6. NEWTON'S VISCOSITY
LAW

7. Shear stress is defined as a force per unit
area, acting parallel to an infinitesimal
surface element. Shear stress is primarily
caused by friction between fluid particles,
due to fluid viscosity
SHEAR STRESS

8. Examplesof
NewtonianFluids
Water, oil, gasoline, alcohol
and even glycerin
are examples of Newtonian
fluids.

9. Examplesof
NonNewtonian
Fluids
Many salt solutions and
molten polymers are non-
Newtonian fluids, as are many
commonly found substances
such as custard, honey,
toothpaste, starch
suspensions, corn starch,
paint, blood, and shampoo.

10. Newtonian fluids have a constant viscosity
that doesn't change, no matter the pressure
being applied to the fluid. This also means
they don't compress.
Non-Newtonian fluids are just the opposite
— if enough force is applied to these fluids,
their viscosity will change.
NewtonianFluids
Verses
NonNewtonianFluids

11. THANK YOU