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The proper valve opening angle in degrees for pipe 1.
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Answer to Problem 6.126P
Explanation of Solution
Given information:
The fluid is water at
The pipe 1 is fitted with a butterfly valve, since the flow rate is equal to
At three reservoir junction, if all flows are considered positive towards the junction, then
Assuming the gauge pressure
To solve this type of problems, we should guess the position of
If the
Since pipe 1 is fitted with a butterfly valve, the above equation can be written as,
Calculation:
Assume, the water at
The roughness of galvanized iron is equal to,
Assume
For pipe 2,
Calculate the velocity,
Calculate the flow rate,
For pipe 3,
Calculate the velocity,
Calculate the flow rate,
But we know that,
Therefore,
The velocity of the flow in pipe 1 is equal to,
To calculate the value of the loss co efficient,
Therefore, according to the graph 6.19, we can say that,
The opening angle of the butterfly valve is equal to almost
By further iteration we can get more accurate answers.
Conclusion:
The opening angle of the butterfly valve is equal to almost
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Chapter 6 Solutions
Fluid Mechanics
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