### Post by chemix on Jun 27, 2019 10:34:05 GMT -6

Hi all,

I am new to the method of CFD-PBE coupling and I would like to use it to an emulsification process. From what I have read in the literature so far, the basic concept of the PBE approach is to setup the PBE integro-differential equation with terms for birth and death of particles. If the internal coordinate is the size of the particle (d) then birth and death of particles with a specific d needs to be described by a model. In the case of emulsification, this would be the formation of a droplet with size d, which , depending on the model is a function of the interfacial tension, viscosites of inner and outer phase, volumetric ratio of the inner and outer phase and from the flow side a function of e.g. epsilon for the energy dissipation rate.

Assuming a one-way coupling my expectation from such a code would be the following workflow:

1. CFD field Generation e.g. with simpleFoam

2. Defining breakup and coalescence (for highly diluted flows not necessary) models in a dictionary.

3. Defining the viscosities of the two phases and the interfactial tension (and other) in a dictionary

4. Solving the PBE on the flow calculated by simpleFoam, which provides the epsilon as one of the indipendend variable of the PBE

5. Getting the final distribution of the droplet sizes or the moments where I can reconstruct the distribution based on a predefined expected type of distribution

Is this something that this code can provide?

Thank you for the support!

Chemix

I am new to the method of CFD-PBE coupling and I would like to use it to an emulsification process. From what I have read in the literature so far, the basic concept of the PBE approach is to setup the PBE integro-differential equation with terms for birth and death of particles. If the internal coordinate is the size of the particle (d) then birth and death of particles with a specific d needs to be described by a model. In the case of emulsification, this would be the formation of a droplet with size d, which , depending on the model is a function of the interfacial tension, viscosites of inner and outer phase, volumetric ratio of the inner and outer phase and from the flow side a function of e.g. epsilon for the energy dissipation rate.

Assuming a one-way coupling my expectation from such a code would be the following workflow:

1. CFD field Generation e.g. with simpleFoam

2. Defining breakup and coalescence (for highly diluted flows not necessary) models in a dictionary.

3. Defining the viscosities of the two phases and the interfactial tension (and other) in a dictionary

4. Solving the PBE on the flow calculated by simpleFoam, which provides the epsilon as one of the indipendend variable of the PBE

5. Getting the final distribution of the droplet sizes or the moments where I can reconstruct the distribution based on a predefined expected type of distribution

Is this something that this code can provide?

Thank you for the support!

Chemix