2.7. Calculating Reynolds Number

Try these first

1. 1.

   Define Reynolds number.

   Hint

   What does it measure about fluid flow?

2. 2.

   What is the formula for Reynolds number?

   Hint

   What three quantities are involved in the formula?

3. 3.

   What does a higher Reynolds number indicate?

   • Turbulent Flow
   • Laminar Flow
   • Steady Flow

   Hint

   Think about the flow characteristics.

4. 4.

   True or False: A Reynolds number less than 2000 describes turbulent flow.

   • True
   • False

   Hint

   Consider the transition points defined for flow types.

5. 5.

   A water body has a hydraulic radius of 0.75 m and flow velocity of 1.5 m/s. Calculate its Reynolds number. Given viscosity is 1.0 × 10^-6 m²/s.

   Hint

   Identify each component in the calculation.

6. 6.

   Design a small channel with specified velocity and width. Calculate Reynolds number under varied conditions: low and high viscosity fluids.

   Hint

   Try simulating changes in velocity or dimensions to observe outcomes.