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December 12, 2011, 09:21 |
thermal diffusivity
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#1 |
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Tobias Holzmann
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Hi all,
i 've implemented the temperaturfield and a temperature dependen saturation pressure on the interPhaseChangeFoam. In the icoFoam tutorial in which the temperature is implemented there is a factor DT = 0,002 I ve read that DT = k / cp * rho. if i wanna simulat water (20°C) i ve to change that DT to 1,4e-7 is that correct? I am not sure couse in the calmers report there is DT added with the value of 0,002 and water is the fluid ? ! ? Tobi |
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December 13, 2011, 03:36 |
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#2 |
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Anton Kidess
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Yes, that's correct, the thermal diffusivity of water is roughly 1.4e-7 m2/s.
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December 13, 2011, 05:03 |
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#3 |
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Tobias Holzmann
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hey akidess,
thx for you answer. In my case i vaporize water with a new myInterPhaseChangeFoam solver. I added a temperatur dependen pSat and implemented the temperature field with the code: Code:
{ fvScalarMatrix TEqn ( fvm::ddt(T) + fvm::div(phi, T) - fvm::laplacian(DT, T) ); TEqn.solve(); } is that correct? Couse if i set the DT from 0,002 to 1,4e-7 i get a better thermal flux in the fluid ?? I thought that the temperature flux is worser with 1,4e-7 than with 0,002 ? Is that correct? Hope you understand what i am meaning. |
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December 13, 2011, 07:02 |
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#4 |
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Anton Kidess
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Which student report? Provide a better link, so that I don't have to sift through the entire site.
What do you mean with a better thermal flux? Either it is physical, or it is not. Also, how can you neglect the release of latent heat in your phase change solver?
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December 13, 2011, 10:00 |
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#5 | |
Super Moderator
Tobias Holzmann
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Quote:
Hi, sorry for the link. Here is the student report http://www.tfd.chalmers.se/~hani/kur...ChangeFoam.pdf I `ll place 2 videos today or tomorrow with the explanation of my problem. thanks in advance. Tobi |
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