21.2.2. Horizontal Water Jet Impact Problem

Try these first

1. 1.

   What is the beta factor for laminar flow?

   Hint

   Consider the typical value used in calculations.

2. 2.

   Define momentum flux.

   Hint

   Think about momentum per unit area per time.

3. 3.

   What is the beta factor for laminar flow?

   • 1
   • 1/2
   • 1/3

   Hint

   Think of the ratio of actual to average velocities.

4. 4.

   In turbulent flow, the velocity distribution is typically:

   • True
   • False

   Hint

   Consider how turbulence affects flow speed.

5. 5.

   A jet of water strikes a vertical flat plate with a velocity of 15 m/s and a height of 2m. Calculate the total momentum exerted by the water on the plate per second.

   Hint

   Set up the flow area and consider that momentum will be affected by both height and speed.

6. 6.

   How would the required force to hold a sluice gate change if the water height increases from 5m to 8m, while keeping velocity constant? Calculate the new force.

   Hint

   Pressure increases with height; recalculate using hydrostatic pressure principles.