Learning Forum

[Majid Panahi]

Hello everyone

I want to simulate the drying of moist porous by hot air convective.

Hot air inlet from impinging jet and collision with moist porous, also start process of drying, and outlet moist air.

Should I use what model?Eulearian?Vof?Spaces transport?...

Should I define 3 Phase?

Should I define primary phase is air? And secondary phase is water liquid?and water vapor?

Thanks for your reply and help me please

[SRP]

 

Hi,

you can use the eulerian model with the Multiphase Model in ANSYS Fluent. You can define primary phase as Air (gaseous phase), secondary phase: water liquid (moisture in the porous material), third phase as water vapor (evaporated from the porous material). you can use species transport to track the concentration of water vapor in the air and define the mass transfer between the water liquid phase in the porous material and the water vapor phase.

Hope this helps you.

 

[Majid Panahi]

Hi,Thanks for your reply

According to the picture, what mechanism should I use?

[SRP]

 

Hi,

You can go with evaporation condensation model since fluid is getting evaporated in the drying.

As in all interphase mass transfer models in Fluent, if a gas mixture is involved in an interphase species mass transfer process, it is always treated as a “to”-phase and the liquid mixture as a “from”-phase.

You can check ansys theory guide for more detail: 14.7.7. Interphase Species Mass Transfer (ansys.com)

Thank you

 

[Majid Panahi]

Thanks

I checked details of 14.7.7,

Do I have to buy account for access the theory?

[SRP]

Hi,

No you do not require to buy.

If you are not able to access the link. please refer to this forum discussion:Using Help with links (ansys.com)

Thank you.

[Majid Panahi]

Hello SRP,

I do simulate the drying of moist porous with Eulearian model. Now I want to added the PCM to my simulate, But there is a problem  and that is, when I do select the Eulearian  model, the Melting option isn't active but when I do select other model such as VOF or etc the Melting option is active. Should I change simulation multiphase model? 

[SRP]

 

Hi,

There is a limitation that in eulerian model, melting model cannot be activated.

You can check theory guide: 14.5.2. Limitations of the Eulerian Model (ansys.com)

As a alternative approach, you can create a udf based on specific heat. You can have a look at fluent customization manual: Fluent Customization Manual (ansys.com)

Hope this helps you.