# Flow between parrall plates entry length formual?

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 August 2, 2002, 14:13 Flow between parrall plates entry length formual? #1 S. S. Mudathir Guest   Posts: n/a 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

 August 3, 2002, 14:05 Thanks, and no need to reply, I got the answer #2 S. S. Mudathir Guest   Posts: n/a Thank you very much, no need to answer this question because I got the answer. It is found in shilchting.

June 24, 2015, 04:43
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YAN YUE
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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!

June 24, 2015, 07:34
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shahrooz
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 Originally Posted by yuebanwan 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.

 June 24, 2015, 08:24 #5 Senior Member   Filippo Maria Denaro Join Date: Jul 2010 Posts: 3,141 Rep Power: 36 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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