Wall Heat Transfer Coefficient
 

Hello sir,
I want to write CEL Expression for wall heat transfer Coefficient to calculate
wall heat flux (Q) but in my problem wall is at middle of an encloser i want to calculate Q for both sides of wall how to specify particular surface to calculate
Wall Heat Flux (Q) in CFX.
Thank you sir.

Hi, post an image of your problem please.

If you're going to deduct wall heat transfer coefficient then I believe (one of the more experienced CFD engineers can correct me on this) you must have adequate refinement at the wall in order to resolve the thermal boundary layer, which is usually smaller than a viscous boundary layer!

Wall Heat Transfer Coefficient
 

Hello Sir,
Thank You for your Reply
I uploaded image (http://s8.postimage.org/vkixp5sxh/CFD.jpg)
i want to calculate heat transfer coefficient at wall side 1 and side 2 and also heat transfer rate if we subject wall for different temperature conditions or varying Temperature
Thank you sir.

Hi,

Please describe:
1. What your boundary conditions are.
2. Working fluid (water, air, or other).

It looks like a simple problem but without more thorough information I can't be of any help.

Are you simulating this as a conjugate heat transfer simulation? That is, including heat transfer in the wall?

Wall Heat Transfer Coefficient
 

Hello sir,
Thank you for your quick reply
i am simulating this as a conjugate heat transfer problem
Boundary conditions are
1.Varying Temperature With Time To middle Wall
2.Material Working Medium-air at 25 C , Wall = Copper
3.All other walls are adiabatic
Thank You

What do you mean by "varying temperature with time to middle wall".

Varying Wall Temperature
 

Hello sir,
I am applying This(http://s23.postimage.org/plc9nhfcb/cfd.jpg) type boundary
condition to Middle Wall

In that
x-axis Time in Seconds
Y-axis Temperature in Kelvin
(all this for transient case)
Thank you sir

If you already know the temperature of the middle wall then why are you simulating the middle wall as a CHT solid? Just impose your temperature function as a temperature boundary and nothing else is required.