Hi Rob, Thank you very much for your reply! I am using DPM source terms. I have checked the customization manual and it seems that these terms have units of something/s, and that the volume unit is derived from the cell volume. I am trying to work in steady state for both phases (steady tracking). Also, my problem is the inverse, the composition in the particles is too small compared to what disappears from the fluid. My model is intended to track the transfer of a species from the fluid to the particles. The amount that disappears from the fluid is expected to be in the particles, but the overall concentration is lower than it should be. I don't think the problem is in the formulation of both source terms, because they are described in the same way. In that term the time unit is derived from a matter transfer coefficient.
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