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Comparing pressure loss to Blasius 
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#1
Feb2012, 12:49 PM

P: 3

Hi everyone. i have done a CFD smulation in fluent for a turbulent pipe flow and have plotted static pressure against distance x. from the graph i get a straight negtive gradient. i have been told that you should compare the pressure loss to Blasius equation and Darcy equation. How do i compare the pressure loss to this. thank you. the fluid is water, diameter is 50mm, inlet velocity is 1m/s and reynolds number 49760.
heres is the xy plot i get. 


#2
Feb2012, 01:12 PM

PF Gold
P: 1,503

Well that seems awfully silly to compare to Blasius because (A) it is pipe flow, so Blasius is not representative, and (B) it is turbulent, so Blasius doesn't apply.
Comparing to DarcyWeisbach should be straightforward though. 


#3
Feb2012, 01:19 PM

P: 3

The Blasius friction factor f=0.079/(Re^0.25).
Is there a way to calculate friction factor from the presure drop? that is what i think i need to do and then compare to blasius friction. 


#4
Feb2012, 06:10 PM

PF Gold
P: 1,503

Comparing pressure loss to Blasius
Ah, I thought you were referring to the Blasius boundary layer. My mistake.



#5
Feb2212, 07:46 AM

P: 3

How do i do this then. im a bit confused.



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