17.5. Energy in Turbulent Flows

Try these first

1. 1.

   What is a turbulent flow?

   Hint

   Think about how water behaves in a river versus a still pond.

2. 2.

   What is the Reynolds number used for?

   Hint

   Consider the number used to differentiate flow types.

3. 3.

   What type of flow occurs at Reynolds numbers less than 2300?

   • Laminar Flow
   • Turbulent Flow
   • Transitional Flow

   Hint

   Consider the definitions and how Reynolds numbers classify flow types.

4. 4.

   True or False: Turbulent flow is characterized by chaotic and irregular velocities.

   • True
   • False

   Hint

   Think about the characteristics that define turbulence.

5. 5.

   Given a pipe with a diameter of 0.1 m, a fluid density of 800 kg/m^3, and a velocity of 5 m/s, calculate the Reynolds number. Is the flow laminar, transient, or turbulent?

   Hint

   Remember the Reynolds number formula and the classification thresholds.

6. 6.

   In an experimental setup, flow starts becoming turbulent at a Reynolds number of 2500. If the viscosity is 0.001 Pa.s, what is the maximum average velocity before reaching turbulence in a pipe of 0.1 m diameter?

   Hint

   Use the Reynolds number formula carefully and ensure good assumptions about density and viscosity.