Thin material approach for interfaces

clarkent · February 25, 2011, 10:25

Does anybody know if CFX's interface model option of "Thin Material" for Heat Transfer takes into account of 3D heat conduction? Or, does it calculate the heat transfer in solid only for normal to the surface direction?

Any help will be appreciated.

Thanks and regards

joey2007 · February 25, 2011, 13:47

Only normal. It is just an additional heat resistance. Otherwise you have to mesh it in 3D.

clarkent · February 25, 2011, 14:32

Thanks joey.

l.te · September 10, 2012, 06:18

Hi,
I have to model an interface between a die and a resin part, that during the cure phase, shrinks, detaching from the die.
In the die-part interface I set an Interface Model-Thin material but when I insert my thickness, that is a function of temperature (T) and cure degree (alfa), I obtain an error message that say that :
"The parameter 'Thickness' in object '/FLOW:Flow Analysis 1/DOMAIN INTERFACE: Default Solid Porous Interface/INTERFACE MODELS/HEAT TRANSFER/HEAT TRANSFER INTERFACE MODEL' is defined to be "Single Valued" but it depends on the following field valued variables: , T, alfa.

Can anyone help me?

evcelica · September 10, 2012, 10:36

Seems like you have to make the thickness a single value, not a dependant variable. Since it is onlt a heat resistance you can achieve the exact same effect be having your material properties (thermal conductivity) of your this material depend on T and alpha.

l.te · September 10, 2012, 11:31

Quote:

Originally Posted by evcelica

Seems like you have to make the thickness a single value, not a dependant variable. Since it is onlt a heat resistance you can achieve the exact same effect be having your material properties (thermal conductivity) of your this material depend on T and alpha.

Thanks for the reply, I'll reflect about this alternative..

February 25, 2011, 10:25	Thin material approach for interfaces	#1
clarkent New Member Join Date: Oct 2010 Posts: 23 Rep Power: 16	Does anybody know if CFX's interface model option of "Thin Material" for Heat Transfer takes into account of 3D heat conduction? Or, does it calculate the heat transfer in solid only for normal to the surface direction? Any help will be appreciated. Thanks and regards

February 25, 2011, 13:47		#2
joey2007 Senior Member Join Date: Mar 2009 Location: Europe Posts: 169 Rep Power: 18	Only normal. It is just an additional heat resistance. Otherwise you have to mesh it in 3D. __________________ - - - - - ------------------------------------------------------------------------ Please do not forget: I am not paid for answering your questions. Thousands of issues can cause a division by zero. Please do not capture a thread, with the argument: "I have the same issue ...."

September 10, 2012, 06:18	Thin material approaches for interfaces	#4
l.te New Member Join Date: Sep 2012 Location: Europe Posts: 25 Rep Power: 14	Hi, I have to model an interface between a die and a resin part, that during the cure phase, shrinks, detaching from the die. In the die-part interface I set an Interface Model-Thin material but when I insert my thickness, that is a function of temperature (T) and cure degree (alfa), I obtain an error message that say that : "The parameter 'Thickness' in object '/FLOW:Flow Analysis 1/DOMAIN INTERFACE: Default Solid Porous Interface/INTERFACE MODELS/HEAT TRANSFER/HEAT TRANSFER INTERFACE MODEL' is defined to be "Single Valued" but it depends on the following field valued variables: , T, alfa. Can anyone help me? Last edited by l.te; September 10, 2012 at 07:16.

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February 25, 2011, 14:32		#3
clarkent New Member Join Date: Oct 2010 Posts: 23 Rep Power: 16	Thanks joey.

September 10, 2012, 10:36		#5
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,193 Rep Power: 24	Seems like you have to make the thickness a single value, not a dependant variable. Since it is onlt a heat resistance you can achieve the exact same effect be having your material properties (thermal conductivity) of your this material depend on T and alpha.