Periodic pressure gradient.
Hi,
I am modelling a 3d periodic flow of air in a tube with wire coil insert (using relizable ke model), and after 1500 iterations i get a good results of Nusselt number compared to the experimental results, but the friction factor(which is computed this way: f=(dp)/(0.5*density*velocity^2*(length/tube diameter)) is so high compared to the experimental results.:confused: Could you give me any advice about this problem. Thank you in advance 
Any ideas?:confused:

Could you give me any solutions, untill now i couldnt manage to solve this problem.:confused:
Thank you in advance. 
Quote:

Thank you Kamu for your reply :), but there is no need to multiply dp by tube length because its divided by length in f correlation.

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