1.5. Eddy Viscosity

Try these first

1. 1.

   Define eddy viscosity in your own words.

   Hint

   Think about how it differs from standard viscosity.

2. 2.

   What is the formula for Reynolds shear stress?

   Hint

   Consider the components involved in this formula.

3. 3.

   What does eddy viscosity quantify in turbulent flows?

   • Only viscosity
   • Shear stress due to turbulence
   • Pressure differences

   Hint

   Think about what additional components are included in turbulent flow.

4. 4.

   True or False: Eddy viscosity is a fixed property of all fluids.

   • True
   • False

   Hint

   Consider how different flow scenarios might alter this property.

5. 5.

   In a turbulent flow, calculate the shear stress using given values of eddy viscosity, flow density, and velocity gradient.

   Hint

   Refer back to the definitions provided on shear stress and how to apply them.

6. 6.

   Consider a scenario where a fluid flow changes from laminar to turbulent. Discuss how this affects the eddy viscosity and shear stress implications in design.

   Hint

   Think about the structural requirements for different flow regimes.