24.3.3. Coefficient of Discharge

Try these first

1. 1.

   What does the coefficient of discharge (C_d) represent?

   Hint

   Think about how we measure how 'efficient' the flow is.

2. 2.

   If C_d is 1, what does that signify?

   Hint

   Consider ideal flow conditions.

3. 3.

   What represents the coefficient of discharge (C_d)?

   • The ratio of Q_actual to Q_theoretical
   • The theoretical discharge only
   • The actual measured discharge only

   Hint

   Think about efficiency in flow measurements.

4. 4.

   True or False: A coefficient of discharge greater than 1 indicates energy losses.

   • True
   • False

   Hint

   Recall the ideal flow conditions.

5. 5.

   An orifice in a tank has a theoretical discharge of 25 m³/hr but measures only 15 m³/hr when tested. What is the coefficient of discharge, and what design modifications could improve performance?

   Hint

   Reflect on ways to mitigate friction losses.

6. 6.

   If a venturi meter indicates an actual discharge of 50 m³/s with a C_d of 0.9, what is its theoretical discharge? Discuss what factors could affect this in practice.

   Hint

   Consider how the design of the venturi influences flow.