4.5.1. Newtonian Fluids

Try these first

1. 1.

   What is shear stress?

   Hint

   Think about force over a surface.

2. 2.

   What is a Newtonian fluid?

   Hint

   Consider how common fluids behave under stress.

3. 3.

   What is shear stress?

   • Force per unit area
   • Volume per unit area
   • Mass per unit area

   Hint

   Remember, it’s about force applications!

4. 4.

   True or False: Newtonian fluids have a viscosity that changes with shear rate.

   • True
   • False

   Hint

   Think about common fluids and their behavior!

5. 5.

   A fluid has a shear stress of 12 N/m² and a viscosity of 3 N·s/m². What is the velocity gradient?

   Hint

   Use the relationship of shear stress and viscosity to find the gradient.

6. 6.

   Describe the implications for non-Newtonian fluids in engineering applications where fluid behavior varies with shear rate.

   Hint

   Consider where different forces might apply.