14.1.5. Reynolds Number

Try these first

1. 1.

   What is the formula to calculate the Reynolds number?

   Hint

   Think about what each symbol represents in terms of fluid properties.

2. 2.

   Define laminar flow.

   Hint

   Consider how the fluid layers behave.

3. 3.

   What does the Reynolds number measure?

   • Viscosity
   • Inertial Forces
   • Flow Type

   Hint

   Think about how engineers differentiate between smooth and chaotic flows.

4. 4.

   True or False: A lower Reynolds number indicates turbulent flow.

   • True
   • False

   Hint

   Recall the values indicating laminar versus turbulent conditions.

5. 5.

   A fluid has a density of 1000 kg/m³ and an average velocity of 5 m/s. If the length is 0.1 m and the viscosity is 0.001 Pa.s, calculate the Reynolds number.

   Hint

   Use the formula carefully while substituting the values.

6. 6.

   Discuss how variations in temperature could affect the viscosity and thus the Reynolds number of a fluid.

   Hint

   Consider the physical properties of fluids as they react to temperature changes.