Performance coefficient
The performance coefficient (λ) is a characteristic coefficient identifying the pump input power.
The following equations are yielded in conjunction with the pump power output (PQ) and pump input power (P):
ρ Density of fluid handled
η Pump efficiency
U2 Circumferential velocity at the impeller outlet
D2 Impeller diameter at the outlet
b2 Impeller outlet width
φ Flow coefficient
ψ Head coefficient
