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-   -   Flow between parrall plates entry length formual? (https://www.cfd-online.com/Forums/main/4997-flow-between-parrall-plates-entry-length-formual.html)

 S. S. Mudathir August 2, 2002 14:13

Flow between parrall plates entry length formual?

I am trying to compare the solution of the problem of laminar flow between parrallel plates with pressure gradiance using CFD pacakges and theory. I want to know where can I find the formula of the entry length (the length at which the flow reaches it's full development state). I found this formula for pipes in many reference of fluid mechanics but I didn't for the parrallel plates. If anybody can help I would be gratefull. S. S. Mudathir

 S. S. Mudathir August 3, 2002 14:05

Thank you very much, no need to answer this question because I got the answer. It is found in shilchting.

 yuebanwan June 24, 2015 04:43

Quote:
 Originally Posted by S. S. Mudathir ;20805 Thank you very much, no need to answer this question because I got the answer. It is found in shilchting.
HI,
I want to know where can I find the formula of the entry length. Please, thank U!

 shahrooz.omd June 24, 2015 07:34

Quote:
 Originally Posted by yuebanwan (Post 551889) HI, I want to know where can I find the formula of the entry length. Please, thank U!
I Bejan's book on convection you can find 3 relations: (X/D)/(Re) ~ 0.04 is the largest one which is from schlichting.

 FMDenaro June 24, 2015 08:24

you can estimate in a very simple way, just use the laminar boundary layer law delta=delta(x) from some of those in literature and fix the condition delta=H/2 to estimate the corresponding x.

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