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-   -   what is the fully developed fluid flow? (http://www.cfd-online.com/Forums/cfx/23287-what-fully-developed-fluid-flow.html)

charles November 9, 2006 15:21

what is the fully developed fluid flow?
 
Hi all,

I want to know that what are physical characteristics of fully developed fluid flows? or what is the fully developed fluid flow?

Regards.

charles.


Luke November 10, 2006 04:02

Re: what is the fully developed fluid flow?
 
Hi charles A fully developed fluid flow through a pipe is one in which the boundary layer extends to the centreline. Hence the maximum velocity of the boundary layer is the same as the centreline velocity of the pipe.

charles November 10, 2006 04:47

Re: what is the fully developed fluid flow?
 
Hi Luke,

If I understood that flow occurs in the narrow canal flow otherwise boundary layer can not extend to the centerline.it is not watched in the wide openning boundary?

Thanks for help.

Best regards.

charles.

Luke November 10, 2006 05:04

Re: what is the fully developed fluid flow?
 
Fully developed flow is an ideal case and does not occur in reality as a laminar Bl cannot extend to the centreline, it will turn turbulent long before that happens.....

charles November 10, 2006 09:18

Re: what is the fully developed fluid flow?
 
Thanks Luke.

charles.

Bian November 10, 2006 15:50

Re: what is the fully developed fluid flow?
 
Are you sure about this????

As long as the boundary layer (velocity profile) will not change along flow direction, this flow is called fully developed flow.

Johnny November 12, 2006 20:47

Re: what is the fully developed fluid flow?
 
I agree with Bian. Fully developed flow was when you have zero gradients in the streamwise direction.

The one November 13, 2006 10:48

Re: what is the fully developed fluid flow?
 
I would add that zero gradients is for velocity, not for pressure in the streamwise direction.


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