3.7. Final Answers from the Problem

Try these first

1. 1.

   What is the formula to calculate discharge?

   Hint

   Think of how we measure flow over time.

2. 2.

   What does Reynolds number indicate?

   Hint

   Remember the critical value for flow categorization.

3. 3.

   What is the hydraulic diameter of a circular pipe?

   • D
   • 4A/P
   • 2D

   Hint

   Think of how diameter is defined.

4. 4.

   True or False? Laminar flow occurs at high Reynolds numbers.

   • True
   • False

   Hint

   Remember the critical value for classifying flow.

5. 5.

   If the pipe's diameter is halved, calculate the new discharge rate if the original was 4.17 x 10^-3 m³/s.

   Hint

   Think about how area changes with diameter.

6. 6.

   Derive a formula for pressure drop in a long pipe if fluid characteristics (viscosity and density) and flow velocity are altered.

   Hint

   Recall what aspects lead to a change in flow characteristics.