UDF for water evaporation
 

Hi folks:

I will be working on a problem where hot air is passing through a duct and there are some water (liquid) in a place in the duct. As the hot air passing, the liquid water will absorb heat and evaporate to steam. I am planning to use mixture model or VOF but regradless of these model I need an UDF for mass transfer, am I right? Does anybody have this UDF? It will be very helpful for me if some one give it to me. I never wrote an UDF before. Thanks folks. Syed.