[ayousif00]

I'm modeling the temperature change in a room that has several water walls, to do this I've calculated the Latent heat from the evaporation and used that as the heat flux at the water walls BC.

Is this methodology correct? As I've found that results show very low temperatures at the wall (around -5000K when the heat flux is -200W/m2)

[alex_gtz]

Originally Posted by ayousif00

I'm modeling the temperature change in a room that has several water walls, to do this I've calculated the Latent heat from the evaporation and used that as the heat flux at the water walls BC.

Is this methodology correct? As I've found that results show very low temperatures at the wall (around -5000K when the heat flux is -200W/m2)

Do you also want to consider convection and radiation ? or only evaporation ?

[ayousif00]

Originally Posted by alex_gtz

Do you also want to consider convection and radiation ? or only evaporation ?

I want to consider the convection between the water wall and the rest of the room (air). My model right now consists of air and several walls with a negative heat flux BC (-65 w/m2), I've got a feeling that this is the wrong way to approach the setup.

The reason I'm doing it this way is to eliminate modeling the evaporation of water.

[alex_gtz]

Originally Posted by ayousif00

I want to consider the convection between the water wall and the rest of the room (air). My model right now consists of air and several walls with a negative heat flux BC (-65 w/m2), I've got a feeling that this is the wrong way to approach the setup.

The reason I'm doing it this way is to eliminate modeling the evaporation of water.

I understand what you are trying to do. If you put "temperature"as BC type, then FLUENT will compute the heat transfer coeff for each cell and calculate the heat flux at the interface water-wall / air.
BUT this method only consider convection.

If you want to consider evaporation I think that you have to enable species transport equation. I've done that to display the humidity but I am not sure if it takes into consideration the heat flux created by the evaporation... maybe it worth to give it a try.

Otherwise the method you used won't false the results within your fluid domain. It will only display a very low temp at your domain limits but the rest of the fluid domain is valid.

[ayousif00]

Originally Posted by alex_gtz

If you want to consider evaporation I think that you have to enable species transport equation. I've done that to display the humidity but I am not sure if it takes into consideration the heat flux created by the evaporation... maybe it worth to give it a try.

Alright thanks alex, I'll try this method.