Flow between parrall plates entry length formual?

August 2, 2002, 14:13

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, 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

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.

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.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Flow visualization vs. Calculated flow patterns	Francisco Saldarriaga	Main CFD Forum	1	August 2, 1999 23:18
length scales at inlet for internal flows	Anne-Marie Giroux	Main CFD Forum	3	July 5, 1999 21:28
Question on 3D potential flow	Adrin Gharakhani	Main CFD Forum	13	June 21, 1999 05:18
computation about flow around a yawed cone	Tylor Xie	Main CFD Forum	0	June 9, 1999 07:33

June 24, 2015, 08:24		#5
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,763 Rep Power: 71	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.