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icfd April 14, 2009 11:05

Fully developed flow profile
 
Hi All,

I tried to get the fully developed velocity profile in a uniform diameter pipe.
Inlet = Velocity profile
Outlet = Static Pressure = 0
The flow mach number is around 0.35, so I included compressiblity in CFX. when I plotted the profile after 40D, 50D from inlet, I dont get the fully developed profile. The velocity keep on increasing. I think it is due to inclusion of compressiblity(Velocity increases to satisfy continuity equation). I dont think it would make so much difference in velocity in real situation. Am I doing any thing wrong? what you think?

Thanks

harishg April 18, 2009 01:32

How much does it deviate from fully developed flow profile ? Obviously you cannot expect the exact profile since density changes will cause increase or decrease in the velocity.

icfd April 19, 2009 06:55

Fully developed flow profile-compressibility
 
Thanks for your reply. I could see a 7% increase in average velocity across area/line @70D from Inlet when compared with fully developed profile with out compressibility.

rogbrito May 20, 2009 22:21

Do you have these results from experimental data? Ive got to validate ANSYS CFX, using only forced convection between plates.
Rogerio.

Quote:

Originally Posted by icfd (Post 212851)
Hi All,

I tried to get the fully developed velocity profile in a uniform diameter pipe.
Inlet = Velocity profile
Outlet = Static Pressure = 0
The flow mach number is around 0.35, so I included compressiblity in CFX. when I plotted the profile after 40D, 50D from inlet, I dont get the fully developed profile. The velocity keep on increasing. I think it is due to inclusion of compressiblity(Velocity increases to satisfy continuity equation). I dont think it would make so much difference in velocity in real situation. Am I doing any thing wrong? what you think?

Thanks



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