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problem with boiling, evaporation and heating

Posted 24 avr. 2014, 06:09 UTC−4 Fluid & Heat Version 4.3 2 Replies

Lenka Nemsilová
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Hello people.

I have problem with boiling and evaporation in comsol.

I have vertical equipment. This equipment is divided in two parts. In first part is heating and part 2 is boiling+ evaporation.

I need connect these actions and modeled. Has anyone experience with that? Could anyone advise me?

Thanks Lenka
2 Replies Last Post 4 sept. 2014, 03:56 UTC−4
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Hello Lenka Nemsilová

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Suvhashis Thapa
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Posted: 1 decade ago 27 août 2014, 13:14 UTC−4
Hello Lenka,

Were you able to figure out the solution? I am having the similar situation.
Appreciate your help!
Thank you,
Suvhashis
Hello Lenka, Were you able to figure out the solution? I am having the similar situation. Appreciate your help! Thank you, Suvhashis
Lalit Singh
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Posted: 1 decade ago 4 sept. 2014, 03:56 UTC−4
Hello
As far boiling is considered you can go through the tutorial
www.comsol.co.in/model/download/176245/models.cfd.boiling_water.pdf
However I am finding it hard to use the same approach (with some modifications) to model evaporation.

In another approach, to model evaporation from a fixed meniscus, I need to specify the MASS FLUX evaporating from the meniscus (not considering the THIN film region for now).
The expression for mass flux involves TEMPERATURE and PRESSURE of the meniscus (boundary), which therefore I am finding difficult to implement in comsol.

This method has been implemented in the literature.

Can anyone please guide on how to specify this condition in comsol

Outlet B.C: velocity outlet=mass flux/density
but mass flux=f(T_outlet)


Regards
Lalit
Hello As far boiling is considered you can go through the tutorial http://www.comsol.co.in/model/download/176245/models.cfd.boiling_water.pdf However I am finding it hard to use the same approach (with some modifications) to model evaporation. In another approach, to model evaporation from a fixed meniscus, I need to specify the MASS FLUX evaporating from the meniscus (not considering the THIN film region for now). The expression for mass flux involves TEMPERATURE and PRESSURE of the meniscus (boundary), which therefore I am finding difficult to implement in comsol. This method has been implemented in the literature. Can anyone please guide on how to specify this condition in comsol Outlet B.C: velocity outlet=mass flux/density but mass flux=f(T_outlet) Regards Lalit

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