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Old   July 23, 2015, 20:02
Default temperature losing region
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Hi
Can I make a region inside my volume where the gas will rapidly lose temperature depending on the regions temperature as it passes through it.

This is not the same as making the walls a different temperature, also if i patch a region with a temperature that will only be an initialization. I want this region to constantly have a low temperature.
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Old   July 24, 2015, 01:15
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cant you just put in a subdomain and make it a heat source. Then chose a negative value? I can try and pull my heat source model out later on today.
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Old   July 24, 2015, 19:00
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I tried, works. Temperature is sinking. I had 2 models for a buoyancy simulation. One with heated walls and one with a 2nd domain and a heat sourc. If I make the heat flux a negative value, the temperature drops.
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Old   July 24, 2015, 22:59
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how can i relate the heat flux to the temperature, i cant just put in a random negative value can i.
For me the gas passes through a zone with water at 24 C, since I am not doing this as a multiphase simulation and just considering the gas, I want it to lose its temperature as it would to water in that zone if water was there and this was a miultiphase simulatiion. Hope I make sense
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Old   July 24, 2015, 23:38
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you have to put in some heat flux in kW per m^2 on that boundary wall where the gas touches the water. Pipe surface or whatever you are using.
too large heat flux @inlet/outlet

thats the thread I startes on a simular topic. You can make a fluid domain and have a wall with heat flux per m^2. Or make 2 domains, one is a heat source with heat flux per m^3.
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Old   July 25, 2015, 00:33
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OK thanks, I will try this
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