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Just looking at the code, I agree with you. However, the code is not straightforward, and I can't be 100% sure. I need some evidence that the current implementation is wrong and that your proposal is correct. This is a commonly used model; we can't just change it on a hunch. Do you have any evidence? It seems to me that you could prove the correct-ness of this model in the presence of multiple species by creating two cases that simulate the evaporation of a single drop (potentially in a single cell). The drop in the first case would be 100% water. The second would be 50% water and 50% some other species with identical properties to water. If the results were the same, then the handling of Raoult's law would be proven consistent. Can you construct such a test? |
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I agree with you, and the proposed test case is convincing. I will try it later. |
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I have carried out a test with mixed water parcel in a box, with 50% H2O and 50% anotherH2O (with the same liquid properties). The results are different though, with different particle diameter at time=0.5. This indicates that they are evaporating with different rates. I am working with OpenFOAM-6. The orig case was from the $FOAM_TUTORIALS. |
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Thanks for confirming it. More importantly than the evaporation rates being different, if we apply your proposed fix then the evaporation rates become the same. See the attached graphs for before and after. This has been fixed in dev and version 8 by the following commits. https://github.com/OpenFOAM/OpenFOAM-8/commit/dcc529a042ac794e0bff1242d57da4d42824708c https://github.com/OpenFOAM/OpenFOAM-dev/commit/900eb1cf8c7d92e298356337dcf1a63ccadc6038 beforeAndAfter.png (47,940 bytes) |
- Anonymous
