WALL thermal condition = CONVECTION

sagila · October 3, 2012, 16:11

Dear all,

I have to choose “convection” as the thermal condition for my WALL boundary condition.

Then, what shall be used for “heat transfer coefficient (W/m2.K)”? Does it mean “convection heat transfer coefficient (h)” or “overall heat transfer coefficient (U)”?

Another question: when a wall thickness is defined and there is NO shell conduction, shall I define “heat transfer coefficient” and “free stream temperature” on the wall surface and zone which is NOT facing my fluid zone?

Thanks in advance.

sagila · October 4, 2012, 00:53

Dear All,
I would appreciate if anyone could help me.
Thanks.

mvee · October 4, 2012, 01:43

In order to take care of wall conduction, you'll have to user 'U' otherwise consider 'h'.

sagila · October 4, 2012, 02:08

Hi Mahesh,
Thank you for your reply.
Do you mean I should use "U" for my second question, otherwise I should use "h"?

mvee · October 4, 2012, 03:26

When you define wall thickness in Fluent, use 'h', if not then use 'U'.

October 3, 2012, 16:11	WALL thermal condition = CONVECTION	#1
sagila Member sagila Join Date: May 2012 Posts: 39 Rep Power: 13	Dear all, I have to choose “convection” as the thermal condition for my WALL boundary condition. Then, what shall be used for “heat transfer coefficient (W/m2.K)”? Does it mean “convection heat transfer coefficient (h)” or “overall heat transfer coefficient (U)”? Another question: when a wall thickness is defined and there is NO shell conduction, shall I define “heat transfer coefficient” and “free stream temperature” on the wall surface and zone which is NOT facing my fluid zone? Thanks in advance.

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
no-slip wall boundary condition	Atit Koonsrisuk	CFX	3	July 10, 2014 17:10
UDF for wall slipping	HFLUENT	Fluent UDF and Scheme Programming	0	April 27, 2011 12:03
Wall boundary condition in cylindrical co-ordinate	shekharc	Main CFD Forum	3	December 2, 2009 08:20
Wall Boundary Condition in k - epsilon model	abhijeet vaidya	Main CFD Forum	0	July 14, 2002 03:18
what the result is negatif pressure at inlet	chong chee nan	FLUENT	0	December 29, 2001 05:13

October 4, 2012, 00:53		#2
sagila Member sagila Join Date: May 2012 Posts: 39 Rep Power: 13	Dear All, I would appreciate if anyone could help me. Thanks.

October 4, 2012, 01:43		#3
mvee Senior Member Vaze Join Date: Jun 2009 Posts: 172 Rep Power: 16	In order to take care of wall conduction, you'll have to user 'U' otherwise consider 'h'.

October 4, 2012, 02:08		#4
sagila Member sagila Join Date: May 2012 Posts: 39 Rep Power: 13	Hi Mahesh, Thank you for your reply. Do you mean I should use "U" for my second question, otherwise I should use "h"?

October 4, 2012, 03:26		#5
mvee Senior Member Vaze Join Date: Jun 2009 Posts: 172 Rep Power: 16	When you define wall thickness in Fluent, use 'h', if not then use 'U'.