Concept explainers
Repeat Prob. 6-66 by taking into consideration the weight of the elbow v1ose mass is 5 kg.
290
The force acting on the flanges of the elbow.
The force line of action angle with horizontal.
Answer to Problem 67P
The force acting on the flanges of the elbow is
The force line of action angle with horizontal is
Explanation of Solution
Given information:
The volume flow rate is
Write the expression for velocity.
Here, volume flow rate is
Consider inlet point as
Write the expression for Bernoulli equation.
Here, density is
Write the expression for force in x-direction.
Write the expression for force in y-direction.
Write the expression for weight of water contained in the elbow.
Here density of water is
Write the expression for resultant of force on elbow.
Here, resultant force in x-direction is
Write the expression for angle of line of action of resultant force with horizontal.
Here, resultant force in x-direction is
Calculation:
Substitute
Substitute
Refer to table "properties of saturated water" to obtain the density of water as
Substitute
Substitute,
Substitute
Substitute,
Substitute
Substitute
Here, angle of resultant force depends on force component sign.
Here, angle is measured from horizontal in anti-clockwise direction.
Conclusion:
The force acting on the flanges of the elbow is
The force line of action angle with horizontal is
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Chapter 6 Solutions
Fluid Mechanics: Fundamentals and Applications
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