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Pipe flowing compressible fluid

Pipe flowing compressible fluid

Pipe flowing compressible fluid

(OP)
For pipe design flowing incompressible fluid, I use:

Darcy equation   hf = f*(LV^2)/(2gD) and

Colebrook equation  f = 0.25*[-log(0.27*k/D + 2.51/(Re*f^0.5))]^-2

where:
hf =  friction loss
f = friction factor
L = length
V = velocity
g = gravity
D = diameter
k = equivalent roughness
Re = Reynolds number

I would like to know: how to procedure with compressible fluid?
Can anyone here help me?

Thanks.
Luiz

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