Equations Flashcards
1
Q
Bernoulli’s pressure
A
P = p + V²ρ/2 + ρgz
2
Q
Bernoulli’s head
A
H = p/ρg + V²/2g + z
3
Q
Bernoulli’s energy
A
E = p/ρ + V²/2 + gz
4
Q
Head loss
A
(p/ρg + V²/2g + z)₁ + h pump = (p/ρg + V²/2g + z)₂ + h turbine + h loss
5
Q
Stagnant pressure
A
Stagnant pressure = p + ρV²/2
6
Q
Bernoulli’s assumptions (5)
A
1 Steady state 2 Incompressible 3 Streamlined 4 No heat exchange (energy loss) 5 Constant T
7
Q
Mass flow rate
A
m = VAρ
8
Q
Pressure drop due to friction
A
∆P = f x L/D x 1/2 ρV²
9
Q
Reynold’s number
A
Re = ρVD/μ = VD/v
10
Q
Momentum flux correction factor
A
F = m(β₂V₂ - β₁V₁)
11
Q
Forces acting in momentum equations
A
Pressure x Area, viscous, momentum change, gravity, reaction
