Energy grade line (TEL) vs hydraulic grade line (HGL)
In pipe flow, the total energy line lies above the hydraulic gradient line by what amount?
Choose the correct quantity.
Difficulty: Easy
Correct Answer: Velocity head
Explanation:
Concept/Approach
HGL = z + p/γ. TEL = z + p/γ + v²/(2g). The difference (TEL − HGL) is the velocity head v²/(2g).
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