[M.Bahoosh]

Hi,
I am simulating a membrane. For calculation the local water mass flux I need to have the local amount of NaCl.mf on both sides of a 2D face (interface), that I defined it as a membrane.
J water local=k(DeltaP-(NaCl.mf local on memside1*800-NaCl.mf local on memside2*800))
I will be appreciated if someone answers my questions:
1- What should I do about this? (CEL, FORTRAN or something else)
2- How can I write an expression that can calculate and relate the local mass fraction of NaCl on a particular face? (NaCl.mf@UPmembraneface)

[Opaque]

How do you define the membrane ? as a Fluid Fluid domain interface that behaves as a wall, i.e. thin surface ?

If you are using a thin surface, is there an option for mass transfer through the thin surface? I am sure there is an option for transfer of an additional variable where the flux across the surface is proportional to the difference of the variable on both sides.

Hope the above helps,

[M.Bahoosh]

Originally Posted by Opaque

How do you define the membrane ? as a Fluid Fluid domain interface that behaves as a wall, i.e. thin surface ?

If you are using a thin surface, is there an option for mass transfer through the thin surface? I am sure there is an option for transfer of an additional variable where the flux across the surface is proportional to the difference of the variable on both sides.

Hope the above helps,

Hi, thanks for your replyI defined the membrane without considering the permeate channel. I defined the membrane as a thin wall and use a source term to estimate water flux. However, in this model, for defining the NaCl mass fraction on the permeate side of the membrane; I have used an additional variable. This variable calculates NaCl.mf on the permeate side based on NaCl.mf value on the Feed side. My problem is I want to calculate it as an independent variable. I will try your guidance but still can’t define an expression to calculate NaCl.mf on a particular surface (something like NaCl.mf@memside1).

[Pled]

I also try to overcome this problem.