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June 28, 2009, 05:13 |
Need help simulating heat exchanger
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#1 |
New Member
Join Date: Jun 2009
Posts: 9
Rep Power: 16 |
Hi there,
I am currently trying to simulate a 3-D concentric tube heat exchanger and im using gambit and fluent as my simulation tool. The cold fluid is flowing through the outer tube and hot fluid through the inner tube. However the simulation result always show that no heat transfer between those two medium. I've searched online and one possible solution maybe using shadow walls, but i have no idea how to create one. Can anyone please help me and guide me through how to create a shadow wall using gambit?? |
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June 28, 2009, 07:45 |
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#2 | |
Senior Member
Ahmed
Join Date: Mar 2009
Location: NY
Posts: 251
Rep Power: 18 |
Quote:
2- can you describe your BC |
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June 28, 2009, 09:20 |
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#3 |
New Member
Join Date: Jun 2009
Posts: 9
Rep Power: 16 |
Hi, thx for replying.... I'm trying out first with a basic concentric tube. It's like a countercurrent heat exchanger. So, i'll have inlet and outlet flow. And the inner and outer walls. But, problem is i dunno how to let the heat transfer from the inner tube to the outer tube.
I've uploaded the mesh file to the following link, see if it's ok: http://www.mediafire.com/?bv3w5wwmwzm Thanks. |
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June 29, 2009, 03:25 |
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#4 | |
Senior Member
Ahmed
Join Date: Mar 2009
Location: NY
Posts: 251
Rep Power: 18 |
Quote:
I just wanted to check the mesh quality and how it is structured. Look, what I gather from your description, I guess your mesh is not internally connected, that is to say, you have two regions that are not connected. go back to Gambit, join the different regions and form one mesh then export it. Good luck |
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June 29, 2009, 08:09 |
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#5 |
Senior Member
Andrew
Join Date: Mar 2009
Location: Washington, DC
Posts: 209
Rep Power: 18 |
do you have the energy equation turned on?
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June 29, 2009, 09:46 |
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#6 |
New Member
Join Date: Jun 2009
Posts: 9
Rep Power: 16 |
yes, i've turned the energy equation on. Sorry ahmed, im not sure wat u meant by joining both regions together. Could u pls advise? btw, i've uploaded the image of my mesh file.
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June 29, 2009, 11:43 |
That is exactly what I wanted
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#7 | |
Senior Member
Ahmed
Join Date: Mar 2009
Location: NY
Posts: 251
Rep Power: 18 |
Quote:
Display ---> Grid a pop up panel will show up, in the Surfaces list, how many surfaces with wall label you have, and where they are located (you can select and deselect the surfaces you want to display), do you have a wall between the Red colored region and the blue one? If so, go back to Gambit Good Luck |
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June 30, 2009, 09:02 |
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#8 |
New Member
Join Date: Jun 2009
Posts: 9
Rep Power: 16 |
thx for the advice... i'll try to eliminate the extra wall and see if it works. Thx a lot =)
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