[aminhgn]

Hi,

I am trying to write a mass transfer udf. to calculate mass transfer, i need contact area between liquid and air. would you please help me how can I find the contact area in udf which is the height of cell (2d) ?

Thanks,

[pakk]

Do you want to extract the mass transfer from your simulation, or prescribe the mass transfer in your simulation?

If it is the first: you might not need to know the contact area, think of conservation of mass...
If it is the second: then you need to define the contact area in your geometry.

[aminhgn]

Originally Posted by pakk

Do you want to extract the mass transfer from your simulation, or prescribe the mass transfer in your simulation?

If it is the first: you might not need to know the contact area, think of conservation of mass...
If it is the second: then you need to define the contact area in your geometry.

Thank you for your reply. I want to define the mass transfer in my simulation. to prescribe the mass transfer, I am using:
S = Kg*(Wgb-Wge)*A
Which A is contact area. I am calculating this value for each cell, since the cell size is growing from inlet, I am looking for a way to calculate cell height for each cell?