On the chemical reaction model of mfix DEM

Whether mfix DEM supports shrinkage core model, structural void model, uniform reaction model, particle model, etc.
If I want to pyrolyze solid particles in a fluidized bed, what model should I use.

MFIX supports variable-density model (constant density) or constant density (variable diameter ), for other models, currently, you have to code it by yourself.

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How to use code to represent the radius change