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How to model the solid-fluid phase change in CFX

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Old   May 2, 2006, 12:45
Default How to model the solid-fluid phase change in CFX
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Can you give me a general idea, how to model a solid-fluid phase change in CFX?

My problem is, I have a solid domain and a gas domain. I want to model the solid to gas phase change. If I create an interface between those two domains, I found, I can't specify the interface temperature, which is a material property and must be set.

In CFX help file, there are 4 descriptions mentioning the melting. But they didn't give an example. When I try to define an interphase mass change in a multiphase flow, I meet the problem that I can't select a solid-fluid domain. The domain must be eigher pure solid or pure fluid (liquid and gas).

Can anybody tell me what should I do now?

Thank you very much!


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Old   May 25, 2006, 05:54
Default Re: How to model the solid-fluid phase change in C
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Friend, Even I need the same hind of help to madel a phase change solid - liquid either in fluent or CFX. If you get any information please forward me. Thank you
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Old   May 26, 2006, 06:27
Default Re: How to model the solid-fluid phase change in C
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I tried to build up the energy balance at the fluid-solid interface. However, it seems CFX can't read the wall heat flux at that area. Therefore I wrote a user Fortran routine to describe the conduction flux (perhaps later also the radiation flux) at the inteface. Then use the surface energy source term to control the interface surface temperature to the phase change temperature. Later I decide the phase change mass according to the surface energy source. This is only an idea. It is still not successful. Please give me your opnion on that.

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