16.3.2. Critical Flow

Try these first

1. 1.

   What is specific energy?

   Hint

   Think about both flow depth and flow velocity.

2. 2.

   Define the Froude number.

   Hint

   It helps classify types of flow.

3. 3.

   What is the Froude number used for in fluid mechanics?

   • It expresses specific energy.
   • It classifies flow types.
   • It calculates flow depth.

   Hint

   Reflect on its role in understanding fluid flow behavior.

4. 4.

   True or False: Subcritical flow allows surface waves to travel downstream.

   • True
   • False

   Hint

   Contemplate how wave propagation works in different flow regimes.

5. 5.

   Given a rectangular channel with a flow depth of 3 m and a velocity of 4 m/s, calculate the specific energy. Discuss its implications for flow type and potential hydraulic jumps.

   Hint

   Identify flow types based on calculated parameters.

6. 6.

   Design a rectangular channel for a given discharge of 100 m³/s, determining the optimal width and depth while minimizing perimeter. Show your calculations.

   Hint

   Start with the known discharge and incorporate area and perimeter relationships.