[raggiotti]

Precious sirs, good days!

I have a question about drop pressure in fluent.
I made a simulation with two nozzles with characteristcs:
- D.I. 203mm x 560mm length;
- D.I. 102mm x 560mm length;

The drop pressure data and inlet data are attached.

The question is:
These drop pressure results are incoherent with general equation of drop pressure:

hf=(f*l&w^2)/(2*g*D)
hf=89.6 Pa (D.I. 203mm)

And are incoherent with equation according to VDI Heat Atlas, p. 1057.
p=77 Pa (D.I. 203mm)

Can anyone help me in this question?