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[Solution]

In the multi-phase flow model, it is possible to define the mass exchange between the phases by a constant or a UDF. If you want to set in constant, click Interaction… in the Phases panel to open the Phase Interaction panel. Then, click on the Mass tab. Change Number of Mass Transfer Mechanisms to 1. Change Mechanism to constant-rate and set a numerical value. If you want to use a UDF, use the DEFINE_MASS_TRANSFER or DEFINE_LINEARIZED_MASS_TRANSFER macro to define the mass exchange and use, then compile and load it. Then, select user-defined for the Mechanism in the Phase Interaction panel and import the UDF link. In addition, you can also be set using the DEFINE_SOURCE macro. In this case, by the source set of Fluid panel, you need to link to each phase of the source term. Note: DEFINE_LINEARIZED_MASS_TRANSFER macro is available from R14.0 and up.

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