[attaullah]

Hello all,

I am trying to simulate the physical absorption of gas into liquid which is a mass transfer phenomena. I want to model the liquid phase as discrete phase using DPM.

Kindly guide me that " can i use the linearized mass transfer udf given in manual" for this scenario.

Thanks

[pakk]

I want to model the liquid phase as discrete phase using DPM.

Maybe I have to learn more, but I have no idea how you can use a discrete phase DPM model to model a liquid phase. That makes no sense.

[attaullah]

Originally Posted by pakk

Maybe I have to learn more, but I have no idea how you can use a discrete phase DPM model to model a liquid phase. That makes no sense.

Sir i want to take the liquid phase as dispersed phase and by turning on DPM i would be able to introduce the water liquid as droplets .

I have done that but the problem here is in the mass transfer. can i achieve this through the udf given.

[pakk]

Originally Posted by attaullah

Sir i want to take the liquid phase as dispersed phase and by turning on DPM i would be able to introduce the water liquid as droplets .

I have done that but the problem here is in the mass transfer. can i achieve this through the udf given.

Is your 'liquid phase' really droplets floating around (like a cloud), or is it really liquid (like a glass of water)?
If it is like a cloud, you can do the cloud it with dpm. And, with a lot of work, you are probably able to model the absorption of gas into those droplets with a udf, but that will have to be a DPM-udf, not a multiphase udf.

If it is like a glass of water, you are using the wrong approach. DPM is not good for that, use multiphase. And if you use multiphase, you can use this UDF.

[attaullah]

Sir my problem statement is;

I am trying to remove sulphurdioxide gas through water in venturi scrubber and i have to model it. Multiphase models can model it. but the thing is if i am going to use the multiphase model then i have to make the mesh so refine that it has to capture the droplet formation which is computationally expensive so the injection is water is needed to be modeled as an injection so i would have alreaddy the droplets formed. when i use the multiphase models , it provides me the facility to transfer my species from gas phase to liquid phase in the mass interaction tab as shown in attached file.

But when i turned on the dpm model, fluent did show the discrete phase or phase 2 in the TO PHASE tab as mentioned in the given figure.
DPM models allows the interaction of continuous phase with the discrete phase but i am not having problem in defining the interaction in the form of mass transfer.
Manual says that mass and heat transfer from or to discrete phase can be modeled, But how? If you have any idea or experrience , kindly guide me. I shall be grateful.

[eaxhm1]

Hello Attaullah,
Hope you are fine,
I read your post on the mass transfer for absorption using the UDF.
I really need your help please,
I am trying to do the absorption process (acetone liquid absorbs acetone vapor) but I have no ideas how I do it.
Please, could you help me with the UDF and the set of the model?


Hayder

[attaullah]

Originally Posted by pakk

Is your 'liquid phase' really droplets floating around (like a cloud), or is it really liquid (like a glass of water)?
If it is like a cloud, you can do the cloud it with dpm. And, with a lot of work, you are probably able to model the absorption of gas into those droplets with a udf, but that will have to be a DPM-udf, not a multiphase udf.

If it is like a glass of water, you are using the wrong approach. DPM is not good for that, use multiphase. And if you use multiphase, you can use this UDF.

Sir

You have mentioned here the DPM udf which DPM macro will be used for the scenario like this. ?

Thanks