17.3.2. Eddy Formation

Try these first

1. 1.

   What is an eddy?

   Hint

   Think of how water swirls in a whirlpool.

2. 2.

   Define Reynolds number.

   Hint

   It relates inertia to viscous forces.

3. 3.

   What is the critical Reynolds number for laminar flow?

   • 500
   • 2300
   • 4000

   Hint

   Reference the thresholds discussed.

4. 4.

   Eddies are formed primarily in which type of flow?

   • True
   • False

   Hint

   Think about the flow's chaotic nature.

5. 5.

   A pipe has a diameter of 0.2 m, and the average velocity of the fluid is 1 m/s. Calculate the Reynolds number if the dynamic viscosity is 0.001 Pa.s. Discuss whether the flow is laminar or turbulent.

   Hint

   Plug in the values carefully.

6. 6.

   If the turbulent flow in a pipe exhibits a fluctuating velocity component of 0.5 m/s, calculate the additional momentum flux caused by this fluctuation in a cross-sectional area of 0.1 m².

   Hint

   Remember the mass flux formula and apply it for momentum.