Flow between parrall plates entry length formual?

August 2, 2002, 15:13

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, 15:05

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

yuebanwan · June 24, 2015, 05:43

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, 08:34

Quote:

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.

FMDenaro · June 24, 2015, 09:24

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.

August 2, 2002, 15:13	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, 15:05	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.

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June 24, 2015, 09:24		#5
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,882 Rep Power: 73	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.