In pump energy terms, hv represents which type of head?

In pump energy terms, hv represents which type of head?

• A. Static head
• B. Velocity head
• C. Pressure head
• D. Discharge head

Answer: (B)

The concept tested is how head in the pump energy equation is decomposed into elevation, pressure, and velocity components. The velocity head represents the kinetic energy per unit weight of the moving fluid, and it is the part of the total head that depends on how fast the fluid is moving. In the standard energy balance for fluids, total head equals elevation head (z) plus pressure head (p/γ) plus velocity head (v^2/2g). Therefore hv corresponds to velocity head, the v^2/2g term, which grows with the square of the velocity. Static head is the elevation difference, and pressure head is the pressure energy; discharge head isn’t a recognized term in the energy balance.

The concept tested is how head in the pump energy equation is decomposed into elevation, pressure, and velocity components. The velocity head represents the kinetic energy per unit weight of the moving fluid, and it is the part of the total head that depends on how fast the fluid is moving. In the standard energy balance for fluids, total head equals elevation head (z) plus pressure head (p/γ) plus velocity head (v^2/2g). Therefore hv corresponds to velocity head, the v^2/2g term, which grows with the square of the velocity. Static head is the elevation difference, and pressure head is the pressure energy; discharge head isn’t a recognized term in the energy balance.