17.2.3. Difference Between Laminar and Turbulent Flows

Try these first

1. 1.

   Define laminar flow.

   Hint

   Think about how a smooth stream of water behaves.

2. 2.

   What is the Reynolds number?

   Hint

   Consider how it relates to flow speed and viscosity.

3. 3.

   What is the main characteristic of laminar flow?

   • Chaotic motion
   • Parallel layers
   • High energy loss

   Hint

   Think about how smoothly fluid flows in a calm situation.

4. 4.

   True or False: The Reynolds number is used to determine the fluid's viscosity.

   • True
   • False

   Hint

   Recall the definition and purpose of the Reynolds number.

5. 5.

   A fluid with a density of 800 kg/m³ and a dynamic viscosity of 0.002 Pa·s flows through a pipe of diameter 0.05 m at a velocity of 4 m/s. Determine whether the flow is laminar, transitional, or turbulent.

   Hint

   Calculate Reynolds number to classify the flow.

6. 6.

   Describe an engineering situation where turbulence would be ideal, and explain why.

   Hint

   Consider applications that benefit from increased mixing or contact area.