udf for mass transfer
 

i need to wright a udf for mass transfer(diffusion)
phenol is diffusing from oil to water through interface
would you guide me in this regard?
i mean which macro should i use?
is it possible to write udf for this?
is there any ready example availabe for this?
it is very urgent , i would be thankful if u.....
thanks & regards

I am not very sure as i am also new to write UDF. You may try DEFINE_MASS_TRANSFER functions. You need to write your diffusion equation for mass transfer in codes. You may look for some other help as i am also a beginner in UDF.
Good Luck......