Newtonian vs Non-Newtonian Fluid
Fluids play a crucial role in various scientific and engineering applications. Understanding the differences between Newtonian and non-Newtonian fluids helps in grasping their unique behaviours and industrial applications.
What is a Newtonian Fluid?
A Newtonian fluid is a fluid whose viscosity remains constant regardless of the applied shear stress. This means that the flow behaviour remains predictable and follows Newton’s law of viscosity.
What is a Non-Newtonian Fluid?
A non-Newtonian fluid is a fluid whose viscosity changes when shear stress is applied. This means that the flow behaviour does not follow Newton’s law of viscosity and may change depending on external forces.
Key Differences Between Newtonian and Non-Newtonian Fluid
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FAQs on Distinguishing Between Newtonian and Non-Newtonian Fluid
1. What is the difference between Newtonian and non-Newtonian fluids?
Newtonian fluids have a constant viscosity regardless of the applied force, while non-Newtonian fluids change their viscosity depending on the stress applied.
2. What are 2 examples of Newtonian fluid?
Water and air are two examples of Newtonian fluids, as their viscosity remains constant under normal conditions.
3. Is honey Newtonian or non-Newtonian?
Honey is a non-Newtonian fluid because its viscosity decreases when stirred or heated, making it easier to pour.
4. What is the difference between real fluid and Newtonian fluid?
A real fluid considers factors like turbulence and compressibility, while a Newtonian fluid follows the linear relationship between shear stress and viscosity.
5. Is milk a Newtonian fluid?
Yes, milk is generally considered a Newtonian fluid because its viscosity does not significantly change under normal flow conditions.
6. What is a Newtonian fluid example?
Water is a Newtonian fluid because its viscosity remains constant under different flow conditions.
7. What is the difference between compressible and incompressible fluids?
Compressible fluids (like gases) change their density with pressure, whereas incompressible fluids (like most liquids) have nearly constant density.
8. What is the difference between laminar and turbulent flow?
Laminar flow is smooth and orderly, while turbulent flow is chaotic and has eddies and vortices.
9. What is the difference between dynamic viscosity and kinematic viscosity?
Dynamic viscosity measures resistance to shear, while kinematic viscosity considers density and measures flow under gravity.
10. What are Newtonian and non-Newtonian fluids in food?
Milk, water, and oil are Newtonian fluids, while ketchup, yoghurt, and mayonnaise are non-Newtonian.
11. What are the characteristics of Newtonian fluid?
Newtonian fluids have a constant viscosity, linear response to shear stress, and predictable flow behaviour.
