how to model humidity or moisture within fluent?

ljt19960221 · May 6, 2018, 23:32

hi,
Does anybody know how to model humidity in fluent? I understand that the species transport has to be implemented but it is not clear how to set up the model.

I have a humidifier here and I want to know the RH of the surrounding air and moisture level of a wall.

temperature is around 40 degree Celsius, RH is around 40 - 60%.

I need some guide please.
Thank you very muchhh.

e_cfd · May 7, 2018, 09:13

Hi Jian,

You need to define a mixture through the Species model and define proper species in the material menu (i.e. Air and water vapor). Moreover, you need to assign a proper mass fraction of water vapor based on RH and T at the inlet(s) (easily can read from the psychrometric chart).

ljt19960221 · May 11, 2018, 04:51

Thanks for your guide. I have tried it and it worked.

But I wondering why the relative humidity on the wall is all the same as I thought it should be different humidity on different session of the wall.

e_cfd · May 11, 2018, 04:55

If you share a figure illustrating your computational domain and boundary conditions maybe I can help to find out the problem.

miracle_cyq · May 29, 2018, 07:29

Quote:

Originally Posted by e_cfd

If you share a figure illustrating your computational domain and boundary conditions maybe I can help to find out the problem.

I'm doing a humidity field analysis of the atomization of the nozzle. The atomization field is a cylinder with a length of 1 m and a diameter of 0.1 m, with walls on both sides and an outlet on the bottom. I would like to ask, how to set this boundary condition, and how to add humidity? I currently use the combined output model and the DPM model, but as a result, the mass fraction of water has always been zero. I'm confused, please. Thank you.

edris3320 · February 8, 2020, 02:58

hi
anyone know how to use moisture with dpm method? i have particles that want to dry them.
thank alot

vinerm · February 9, 2020, 16:36

I suppose Fluent has a standard tutorial for spray drying. Just search for it.

sara moradi · February 8, 2021, 15:42

Quote:

Originally Posted by edris3320

hi
anyone know how to use moisture with dpm method? i have particles that want to dry them.
thank alot

Hi edris,
I'm looking for moisture content in fluent too. Did you figure out how obtain it?

sara moradi · February 8, 2021, 15:50

Quote:

Originally Posted by vinerm

I suppose Fluent has a standard tutorial for spray drying. Just search for it.

yes, but it does't mention to moisture content.

May 6, 2018, 23:32	how to model humidity or moisture within fluent?	#1
ljt19960221 New Member jian Join Date: May 2018 Posts: 4 Rep Power: 8	hi, Does anybody know how to model humidity in fluent? I understand that the species transport has to be implemented but it is not clear how to set up the model. I have a humidifier here and I want to know the RH of the surrounding air and moisture level of a wall. temperature is around 40 degree Celsius, RH is around 40 - 60%. I need some guide please. Thank you very muchhh.

May 7, 2018, 09:13		#2
e_cfd Member ehsan Join Date: Sep 2014 Posts: 38 Rep Power: 12	Hi Jian, You need to define a mixture through the Species model and define proper species in the material menu (i.e. Air and water vapor). Moreover, you need to assign a proper mass fraction of water vapor based on RH and T at the inlet(s) (easily can read from the psychrometric chart). PJTsai likes this.

February 8, 2020, 02:58	moisture with dpm method	#6
edris3320 New Member Join Date: Sep 2019 Posts: 12 Rep Power: 7	hi anyone know how to use moisture with dpm method? i have particles that want to dry them. thank alot

February 9, 2020, 16:36	Tutorial available	#7
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	I suppose Fluent has a standard tutorial for spray drying. Just search for it. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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May 11, 2018, 04:51		#3
ljt19960221 New Member jian Join Date: May 2018 Posts: 4 Rep Power: 8	Thanks for your guide. I have tried it and it worked. But I wondering why the relative humidity on the wall is all the same as I thought it should be different humidity on different session of the wall.

May 11, 2018, 04:55		#4
e_cfd Member ehsan Join Date: Sep 2014 Posts: 38 Rep Power: 12	If you share a figure illustrating your computational domain and boundary conditions maybe I can help to find out the problem.