Latent heat inaccuracy in evaporative cooling simulation

andrew-c · April 13, 2023, 17:06

I have a simple 2D domain simulating evaporation to still air using mixture model and species mass transfer.

Evaporation occurs at the liquid-air interface, but the temperatures in the steam don't seem to make sense. Evaporative cooling takes place in the liquid (good), but the evaporating water vapor also rises in temperature (bad).

I think it has to do with the enthalpy source terms from mass transfer, but I don't know how to solve this. I am using default values for enthalpies and species-mass-transfer (ranz-marshall correlation for both phases).

Does anyone know why the steam is rising in temperature?

Thank you for your help! Images of steam concentration and temperature profile:

2023-04-13 15_29_52-A_pool-boil-noenergy-validated_BACKUP Parallel Fluent@DESKTOP-TTQLM5V [2d, .jpg

2023-04-13 15_29_36-A_pool-boil-noenergy-validated_BACKUP Parallel Fluent@DESKTOP-TTQLM5V [2d, .jpg

andrew-c · April 14, 2023, 14:03

Edit: resolved on Ansys support forum. Link in case anyone experiences the same problem:

https://forum.ansys.com/forums/topic...n/#post-279549

April 13, 2023, 17:06	Latent heat inaccuracy in evaporative cooling simulation	#1
andrew-c New Member Andrew Join Date: Dec 2022 Posts: 29 Rep Power: 3	I have a simple 2D domain simulating evaporation to still air using mixture model and species mass transfer. Evaporation occurs at the liquid-air interface, but the temperatures in the steam don't seem to make sense. Evaporative cooling takes place in the liquid (good), but the evaporating water vapor also rises in temperature (bad). I think it has to do with the enthalpy source terms from mass transfer, but I don't know how to solve this. I am using default values for enthalpies and species-mass-transfer (ranz-marshall correlation for both phases). Does anyone know why the steam is rising in temperature? Thank you for your help! Images of steam concentration and temperature profile: 2023-04-13 15_29_52-A_pool-boil-noenergy-validated_BACKUP Parallel Fluent@DESKTOP-TTQLM5V [2d, .jpg 2023-04-13 15_29_36-A_pool-boil-noenergy-validated_BACKUP Parallel Fluent@DESKTOP-TTQLM5V [2d, .jpg

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April 14, 2023, 14:03		#2
andrew-c New Member Andrew Join Date: Dec 2022 Posts: 29 Rep Power: 3	Edit: resolved on Ansys support forum. Link in case anyone experiences the same problem: https://forum.ansys.com/forums/topic...n/#post-279549