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san August 31, 2006 01:20

conjugate heat transfer
 
Hi,

i want to solve a problem on conjugate heat transfer (i.e, problem which concentrates both on convection & conduction).

The problem is that of a heat Exchanger one.

cold fluid ( water ) will be flowing through inside the pipe & hot air will be passing over this pipe.

know i want to know the wall temp. of the pipe ( for both inside and outside surfaces of pipe), heat transfer co-efficient and pressure drop.

how to set the problem in CFX.

Thanks in advance for the help provided.

bye san

Joe August 31, 2006 10:06

Re: conjugate heat transfer
 
Covered in the tutorials.

san September 7, 2006 03:00

Re: conjugate heat transfer
 
Hi,

Can you forward that tutorial to my id rsan_2001@rediffmail.com

thanks in advance & with regards san

Robin September 7, 2006 09:23

Re: conjugate heat transfer
 
If you have the software, you have the tutorial already.

fea user September 9, 2006 05:07

Re: conjugate heat transfer
 
Import the geometry from 3D CAD to ANSYS Workbench's DesignModeler. The most important thing is that you have to create multibody part from your assembly. It is done with DesignModeler Tools menu-->From new part. After this you go ANSYS CFX mesher in workbench, and here the mesher will create composite region walls (that means two contact walls on a boundary will join [combine] in one wall). thus the CFX will automatically create this joined wall condition, this will the conjugate heat transfer condition on the wall.

Once more: the main thing is modelling multibodies CAD modell (in your CAD system, or Design modeler), and it will create the appropriate wall model to conjugate heat transfer.

I hope it is usefull.

san September 9, 2006 08:33

Re: conjugate heat transfer
 
Thanks guys,

but if you have any papers/tutorials which covers this concept, please forward the material. This will be very helpfull to me.

If any help file already exists in CFX as an example , give me the name of the file.

Thanks & with regards san

fea user September 11, 2006 05:26

Re: conjugate heat transfer
 
The example's name is in CFX tutorial: Conjugate Heat Transfer...and there are a lot of usefull tutorial files...

san September 12, 2006 10:44

Re: conjugate heat transfer
 
Hi,

i will check it.

Thanks & with regards san


him September 14, 2006 05:43

Re: conjugate heat transfer
 
Hallo San! Did you find tutorial file for your problem? I have to solve a similar problem,but effectively there is no tutorial in which two domains with two different fluids are present! Is it possible set 3 domains: 1 fluid (water), 1 solid and 1 fluid (air)? If yes,how I can do it?

Resh September 15, 2006 00:45

Re: conjugate heat transfer
 
Hi I am solving a conjugate heat transfer problem with three domain. The air domain is sandwiched between two copper domain. I have given Heat flux at one of the surface and fixed temperature at the other surface. The air property I have defined at bulk mean temperature which i have calculated theoretically. The analysis is converging but i am not getting the desired temperature at the surface where i have defined heat flux. Can u suggest me.


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