Material Thickness consideration

sunilpatil · April 28, 2013, 07:22

Hello sir,
In my analysis (as shown in figure) i am applying Heat flux boundary condition to wall. thickness of solid domain is 1mm and fluid domain is of about 2m .my question is
1.if the thermal conductivity of material (Solid domain) is high ex: Tin, then we can neglect the conduction along the thickness so we can apply heat flux directly on fluid domain wall.but for low thermal conuctivity (K) material it is required to consider solid domain. is it possible to create thin material just like in interface on fluid domain side(Without considering solid domain)

http://s24.postimg.org/c3gfvzdfp/cfd_Online.png

Than you sir,
Sunil Patil

ghorrocks · April 28, 2013, 07:48

Yes. The ability to model thermal resistance with interfaces was introduced in either V13, or V14. Can't remember which.

But you seem to want to put a thermal resistance on the outside of a fluid domain. THis is pretty easily done by working out the equations for thermal resistance and imposing that as a thermal flux boundary condition on the fluid domain. SO you have to do a little maths homework, but it is easy to do and works fine.

sunilpatil · April 28, 2013, 10:57

Hello sir,
Thank you for your reply.your great knowledge in CFX helped me a lot
Thank you sir,
Sunil Patil

April 28, 2013, 07:22	Material Thickness consideration	#1
sunilpatil Senior Member sunil Join Date: Jul 2012 Location: Bangalore Posts: 179 Rep Power: 14	Hello sir, In my analysis (as shown in figure) i am applying Heat flux boundary condition to wall. thickness of solid domain is 1mm and fluid domain is of about 2m .my question is 1.if the thermal conductivity of material (Solid domain) is high ex: Tin, then we can neglect the conduction along the thickness so we can apply heat flux directly on fluid domain wall.but for low thermal conuctivity (K) material it is required to consider solid domain. is it possible to create thin material just like in interface on fluid domain side(Without considering solid domain) http://s24.postimg.org/c3gfvzdfp/cfd_Online.png Than you sir, Sunil Patil

April 28, 2013, 10:57	Thermal resistance at domain wall	#3
sunilpatil Senior Member sunil Join Date: Jul 2012 Location: Bangalore Posts: 179 Rep Power: 14	Hello sir, Thank you for your reply.your great knowledge in CFX helped me a lot Thank you sir, Sunil Patil

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April 28, 2013, 07:48		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	Yes. The ability to model thermal resistance with interfaces was introduced in either V13, or V14. Can't remember which. But you seem to want to put a thermal resistance on the outside of a fluid domain. THis is pretty easily done by working out the equations for thermal resistance and imposing that as a thermal flux boundary condition on the fluid domain. SO you have to do a little maths homework, but it is easy to do and works fine.