Generalization of the filtered reaction rate model for gas–solid flows incorporating power‐law kinetic

Abstract This work pursues a generalized filtered reaction rate (FRR) model for reactive gas–solid flows via fine‐grid two‐fluid model (TFM) simulations. The power‐law kinetic with various reaction orders ( n ) is considered. It is well known that the solid‐catalyzed reaction rate is bounded by the kinetic regime (KR) and external mass transfer‐controlled regime (EMTR). It is found that the FRR model maintains excellent predictive performance both for n > 1 in two different regimes and n < 1 in the KR. However, an underprediction is observed at n < 1 within the EMTR. Thus, a modified formula for the FRR model in the EMTR is proposed. Then a generalized FRR model is derived. The assessment for the model is performed via a priori analysis and a filtered TFM simulation. The priori analysis and filtered TFM simulations quantitatively demonstrate that the model exhibits robust predictive capability.