15.1.4. Froude Numbers

Try these first

1. 1.

   Define the Froude number.

   Hint

   Think about how gravity and inertia relate to flow.

2. 2.

   What does a Froude number of less than 1 indicate?

   Hint

   Consider which forces are more influential in this case.

3. 3.

   What is a Froude number less than 1 indicative of?

   • Critical flow
   • Supercritical flow
   • Subcritical flow

   Hint

   Think about the dominance of gravitational forces.

4. 4.

   In supercritical flow, disturbances propagate in which direction?

   • True
   • False

   Hint

   Consider the effect of inertia on flow behavior.

5. 5.

   A design involves a channel that's 5 m wide and 3 m deep. If water flows at 8 m/s, what is the Froude number? Discuss the implications.

   Hint

   Remember to find the effective depth in your calculations.

6. 6.

   Evaluate how changing the channel width from 5 m to 10 m while maintaining velocity could affect the Froude number and justify your reasoning.

   Hint

   Consider how wider channels influence depth and velocity.