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.
Mechanical Engineering
Hydraulics and Fluid Mechanics
Difficulty: Easy
Choose an option
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APressure head
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BVelocity head
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CPressure head + velocity head
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DPressure head − velocity head
Answer
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).
Final AnswerVelocity head