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August 12, 2013, 06:52 |
Heat Transfer Between Fluids
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#1 |
New Member
Join Date: Nov 2011
Posts: 10
Rep Power: 15 |
Hello
I'm trying to model the heat transfer between two different fluids (H2Ovl and Air), and I used the following configuration interface: DOMAIN INTERFACE: hot_cold Boundary List1 = hot_cold Side January 1 Boundary List2 = hot_cold Side 1 Interface Type = Fluid Fluid INTERFACE MODELS: Option = General Connection FRAME CHANGE: Option = None END HEAT TRANSFER: Conservative Interface Option = Flux INTERFACE HEAT TRANSFER MODEL: Material = Copper Option = Thin Material Thickness = 1 [mm] END END MASS AND MOMENTUM: Option = No Slip Wall END PITCH CHANGE: Option = None END END MESH CONNECTION: Option = GGI END END The problem I have is that the "cold fluid" warming fails. apparently exists heat transfer in one direction only, as the hot fluid (air). I would appreciate your help. Greetings. |
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August 12, 2013, 06:58 |
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#2 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,427
Rep Power: 49 |
Did you take into account that the heat storage capacity of liquid water is orders of magnitude higher than that of air?
If you evaluate the results more accurately, I am sure that you will find a minor temperature increase in the cold fluid. |
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August 12, 2013, 07:08 |
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#3 |
New Member
Join Date: Nov 2011
Posts: 10
Rep Power: 15 |
Hello flotus1
I'll change the material of the hot fluid (higher specific heat capacity). Greetings. |
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August 14, 2013, 06:06 |
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#4 |
New Member
Join Date: Oct 2011
Posts: 20
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Hi Cosme
Can u tell me how you activated thin wall between two fluids. I am also modeling heat transfer between two diff fluid separated by thin solid wall. I don’t wish to mesh thin solid domain. I know in Fluent we can assign thickness in wall BC. Please help if someone knows how to do same in CFX. |
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August 14, 2013, 07:31 |
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#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,871
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Make it an interface, and then look at the interface options. You can put a thermal resistance on it, you can connect or disconnect it and all sorts of other things.
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August 14, 2013, 15:49 |
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#6 | |
New Member
Join Date: Nov 2011
Posts: 10
Rep Power: 15 |
Quote:
Complementing what Glenn says, once you generate the interface, on the second tab you just click on the option of heat transfer, and there you will have different wall options. |
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Tags |
cht, fluids, heat, solid, transfer |
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