
The nozzle diameter
Whether the diameter of the nozzle increases or decrease to avoid cavitation.

Answer to Problem 3.135P
The nozzle diameter
To avoid cavitation. in the nozzle, the diameter
Explanation of Solution
Given information:
The temperature of the water flowing inside the nozzle is
Write the expression for the Bernoulli’s equation between the section (1) and section (3) of the given system.
Here, the pressure at section (1) is
Since the fluid at section (1) and section (3) is at the same level
Substitute
Substitute
Write the expression for the area at section (1).
Here, the diameter at section (1) is
Write the expression for the area at section (3).
Here, the diameter at section (3) is
Write the expression for the continuity equation between section (1) and at section (3).
Substitute
Write the expression for Torricelli equation for the velocity at section (3).
Here the acceleration due to gravity is
Calculation:
Substitute
Convert the pressure at section (3) from
Refer to the property table to obtain the vapour pressure of water at
Convert the vapour pressure from
Substitute
Substitute
Conclusion:
The nozzle diameter
To avoid cavitation in the nozzle diameter
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Chapter 3 Solutions
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