Error in UDF moisture transfer
 

Hi all of you.

I am modelling membrane based heat exchanger. I need to make a udf for moisture transfer from one fluid to another in between membrane is inserted.

One fluid is moist air ( Air + water vapor) and other is dessiccant solution (Licl solution). while membrane is PVDF. I have defined moist air but now stuck in moisture transfer.

I am facing error in defining udf. While interpreting udf, I am facing
Can anyone help me out?

Regards

Abbas Raza