= bar
η
=  efficiency nozzle
%
  P 0 = [bar] atmosphere
D
=  pipe diameter
mm
  Info
L
=  length of pipe
m
      
T
=  temperature
C
     Faktor:
n
d [mm]
F  [N]
P hydr. [kW]
Σ  =

c *
=   speed nozzle ( C* = sonic)
m / sec
ρ *
=   denisty
kg / m 3  
T *
=   temperatur
C0  
ρ
=   denisty
kg / m3  
dP
=  pipe pressure drop
bar  
w
=  speed pipe
m / sec  
Re
=  Reynold
μ
=  dynmaic viskosity
* 10-6 Pa s
ν
=  kinematic viskosity
* 10 3 / s  
Ws
=  Speed of sound [p,T]
m / s  
dh
kJ / kg  
ds
kJ / kg K