12.. Velocity Conditions in Nozzles

Try these first

1. 1.

   What is the formula for calculating acceleration in the x-direction in a nozzle?

   Hint

   Think about how velocity changes involve both time and space.

2. 2.

   If the entrance velocity is 10 ft/s, what is the exit velocity if it increases threefold?

   Hint

   Multiply the entrance velocity by 3.

3. 3.

   What is the relation between exit velocity and entrance velocity in a nozzle?

   • Exit = Entrance
   • Exit = 2 * Entrance
   • Exit = 3 * Entrance

   Hint

   Think of common nozzle design examples.

4. 4.

   True or False: Convective acceleration is caused by changes in velocity due to movement through a velocity gradient.

   • True
   • False

   Hint

   Consider how fluid parcels behave in movement.

5. 5.

   A nozzle reduces its diameter from 10 cm to 5 cm. If the inlet velocity is 20 m/s, determine the outlet velocity and changes in pressure in the streamline flow.

   Hint

   Consider both conservation of mass and energy principles.

6. 6.

   In a conical nozzle, the entrance is 1 m wide, and the exit is 0.25 m. Calculate how speed changes if the entrance velocity is 8 m/s.

   Hint

   Think about how the cross-sectional area influences flow.