Hello,
I am running a simulation that includes water phase changes. These phase changes will take place below the boiling point of water so I need a method that can accurately model this. From my understanding and testing so far, the evaporation-condensation model in Fluent will only simulate the phase changes at the water's boiling point. Therefore, I need to code a UDF to model the phase changes more realistically. I have looked into vapourization modeling but frankly have been overwhelmed by the number of methods and I am really unsure which to pick for my scenario. Temperature, pressure, and relative humidity all need to be taken into consideration.
Does anybody know of any models that seem well suited to my needs off the top of their heads? Also, I'd appreciate any literature/tutorials that summarise different models or their application in Fluent.
Thanks.
Hello！Regarding the model for Vaporization and condensation simulation, mainly involves the problem of vapor–liquid phase-change. For solving this problem, the feature of mass conservation is particularly important. The volume-of-fluid (VOF) method and the level set (LS) method are usually used for simulation calculation. At the same time, the VOF method has an inherent mass conservation property, more easily capturing interface with heat transfer of phase change. However, the default VOF method cannot simulate heat and mass transfer through the phase interface, so a user-defined function (UDF) was required.
Hello , the volume of fluid (VOF) model is very helpful for your case study. Only you need to activate local phase discretization and set its value to (1).
For more information, you can refer to my project Heat Pipe.
https://www.researchgate.net/project/Heat-Pipe-3
Regards.
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