1.4. Reynolds Number

Try these first

1. 1.

   What is the definition of Reynolds Number?

   Hint

   Consider forces acting on fluid in motion.

2. 2.

   At what Reynolds Number does flow become turbulent?

   Hint

   Remember the thresholds for laminar and turbulent flow.

3. 3.

   What condition indicates laminar flow?

   • Re < 2300
   • Re > 4000
   • Re = 1000

   Hint

   Remember the thresholds for flow classification.

4. 4.

   True or False: A Reynolds Number greater than 4000 implies turbulent flow.

   • True
   • False

   Hint

   Think about the flow characteristics at different Reynolds Numbers.

5. 5.

   A pipe has a diameter of 10 cm, and water flows at 3 m/s. The kinematic viscosity of water at this temperature is 0.001 m²/s. Determine the Reynolds number and classify the flow.

   Hint

   Use the Re formula and check the conditions for flow classification.

6. 6.

   In an industrial setup, oil is transported through a pipe with a diameter of 15 cm at 1 m/s. The oil has a kinematic viscosity of 0.05 m²/s. Calculate the Reynolds number and state whether the flow is laminar, turbulent, or transitional.

   Hint

   Calculate using the formula and compare against the thresholds.