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what is the fully developed fluid flow?

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Old   November 9, 2006, 15:21
Default what is the fully developed fluid flow?
  #1
charles
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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.

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Old   November 10, 2006, 04:02
Default Re: what is the fully developed fluid flow?
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Luke
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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.
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Old   November 10, 2006, 04:47
Default Re: what is the fully developed fluid flow?
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charles
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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.
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Old   November 10, 2006, 05:04
Default Re: what is the fully developed fluid flow?
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Luke
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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.....
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Old   November 10, 2006, 09:18
Default Re: what is the fully developed fluid flow?
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charles
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Thanks Luke.

charles.
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Old   November 10, 2006, 15:50
Default Re: what is the fully developed fluid flow?
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Bian
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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.
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Old   November 12, 2006, 20:47
Default Re: what is the fully developed fluid flow?
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Johnny
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I agree with Bian. Fully developed flow was when you have zero gradients in the streamwise direction.
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Old   November 13, 2006, 10:48
Default Re: what is the fully developed fluid flow?
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The one
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I would add that zero gradients is for velocity, not for pressure in the streamwise direction.
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