About the agglomeration of particles in chemical reactions

hello,dear MFIX developer. When I added pure endothermy chemical reaction based on the example of silane cracking, I found that there would be intense reunion when the case was set:heat of reaction =178000000, fraction assigned to fluid =0.99, fraction assigned to solid =0.01. But when it was set:heat of reaction =178000000, fraction assigned to fluid =0.01, fraction assigned to solid =0.99, there is no obvious reunion. So question (1): Why does this setting cause particles to agglomerate?
I guess the pressure gradient caused by the change in the temperature gradient caused the particles to agglomerate, but I don’t know what should be the problem. Question (2)How do I set it up so that the fluidization is normal and consistent with reality.
Thank you very much.CACO3_decomposition_pic_3d.mfx (28.1 KB) usr_mod.f (134 Bytes) usr_rates_des.f (7.8 KB) usr0.f (2.0 KB) usr1.f (3.7 KB)

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