Newtonian vs Non-Newtonian Fluids

Newton's Law of Viscosity

• Shear stress is directly proportional to shear rate in Newtonian fluids.
• The relationship can be expressed mathematically as τ = μ * (du/dy), where τ is shear stress, μ is dynamic viscosity, and (du/dy) is the shear rate.

Defining Characteristic of Newtonian Fluids

• Newtonian fluids maintain a constant viscosity regardless of the shear rate applied.
• Their flow behavior is predictable and follows a linear relationship between shear stress and shear rate.

Examples of Newtonian Fluids

• Water is a common example of a Newtonian fluid.
• Other examples include air, mineral oils, and alcohols.

Properties of Newtonian Fluids

• Exhibits a uniform viscosity that does not change with the rate of shear.
• Flow properties can be reliably characterized by the fluid's viscosity value, which is constant at a given temperature.

Applications of Newtonian Fluids

• Ideal for use in applications requiring consistent flow characteristics, such as hydraulic systems, lubricants, and where precise fluid movement is necessary.
• Commonly used in engineering processes and various industrial applications that involve mechanical systems.

Explore the difference between Newtonian and Non-Newtonian fluids in this quiz. Learn about the behavior of Newtonian fluids according to Sir Isaac Newton's law of viscosity, and how they differ from non-Newtonian fluids in response to applied shear force.