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The total energy of flow of fluid is the sum of kinetic energy and potential energies. It can be written in terms of head.
E = velocity head + pressure head + elevation head
Where velocity head is the kinetic energy pressure head and elevation head are the potential energies. In symbol, the formula is
E = v2/2g + p/γ + z
To use the Bernoulli's theorem on fluid flow, consider two points within the path of flow. Label the upstream as 1 and the downstream as 2. Neglecting head lost, the energy at 1 is the same as the energy at 2. Thus,
E1 = E2
or in complete equation
v12/2g + p1/γ + z1 = v22/2g + p2/γ + z2
Considering the lost of energy between the two points, the equation will be
E1 - HL = E2
or
v12/2g + p1/γ + z1 - HL = v22/2g + p2/γ + z2
For more information about the formulas and how to do the calculations, refer to the "Sources and related links:" below.
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