Latent heat inaccuracy in evaporative cooling simulation

andrew-c · April 13, 2023, 16:06

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, 13:03

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, 16:06	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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Calculating heat ballance in transient simulation	karachun	CFX	6	January 28, 2022 02:23
heat not balanced in the chtMultiRegionSimpleFoam solver	carye	OpenFOAM	19	September 26, 2019 04:25
Domain Reference Pressure and mass flow inlet boundary	AdidaKK	CFX	75	August 20, 2018 05:37
Some questions about flow boiling simulation in Fluent	beastieboys6	FLUENT	8	November 20, 2017 23:47
Brake cooling simulation	Vejby	FloEFD, FloWorks & FloTHERM	1	February 14, 2016 14:10

April 14, 2023, 13:03		#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