7.1.3. Newtonian and Non-Newtonian Fluids

Try these first

1. 1.

   What is a Newtonian fluid? Give an example.

   Hint

   Think of fluids that flow easily and maintain consistent behavior.

2. 2.

   Define shear stress.

   Hint

   Consider the direction of force relative to the surface.

3. 3.

   Which of the following is a characteristic of Newtonian fluids?

   • They have a variable viscosity
   • They maintain a constant viscosity under shear.
   • They require a specific yield stress to flow.

   Hint

   Recall the definition of Newtonian fluids.

4. 4.

   True or False: Shear-thinning fluids increase in viscosity with increased shear rate.

   • True
   • False

   Hint

   Consider how a thick liquid might behave when it is agitated.

5. 5.

   Given a fluid that behaves as a shear-thinning fluid in a pipeline, describe how the viscosity might change if flow rates increase significantly over time. What real-world scenarios might illustrate this effect?

   Hint

   Think about how different types of liquids are handled on assembly lines.

6. 6.

   In an application where a Bingham plastic is used, explain how the applied stress influences its flow under varying conditions, and suggest potential issues that might arise in mechanical systems.

   Hint

   Consider how different forces affect system efficiency.