2.1.3. Substitution and Calculation

Try these first

1. 1.

   What is the Darcy-Weisbach equation used for?

   Hint

   Think about energy losses.

2. 2.

   List two factors that affect head loss in a pipe.

   Hint

   Consider the physical dimensions of the pipe.

3. 3.

   What does the Darcy-Weisbach equation primarily calculate?

   • Head gain
   • Head loss
   • Pressure increase

   Hint

   Consider what happens to energy in the flow.

4. 4.

   True or False: Minor losses can be ignored in large systems.

   • True
   • False

   Hint

   Think about how bends and valves might affect flow.

5. 5.

   A 1000 m length of 0.1 m diameter pipe has a friction factor of 0.02. What is the head loss if the flow velocity is 2 m/s?

   Hint

   Check your units! They must be consistent throughout the equation.

6. 6.

   You need a pump for a system with a total head of 50 m and minor losses adding up to 10 m. If the required flow rate is 0.1 m³/s, calculate the necessary horsepower.

   Hint

   Check your pump design; consider efficiency losses.