I am trying to come up with a code for simultaneous heat and mass transfer for water evaporation owing to solar flux. The incoming heat flux contributes to volumetric heat generation within a given node and heats the water resulting in evaporation. I am using finite difference technique to solve this, but failing to come with a reasonable solution. If there are any codes available to be used as a reference, I would like to see it to understand where I am going wrong.

Any suggestions will be highly appreciated.

Regards

Sai Kiran