Validation study of a Spatially-Averaged Two-Fluid Model for heat transport in gas-particle flows

We validate a multi-scale turbulence model for the thermal energy estimation in coarse-grid simulations of moderately dense gas-particle flows. The is based on spatially-averaging Two-Fluid Model balance equations including equation both phases. found, that drift temperature valid measure heat transfer reduction due to heterogeneous particle clusters. Furthermore, we propose dynamic through application test-filters and solution transport variances phase temperatures solid volume fraction. Closure models Reynolds stress contributions are single-phase Large-Eddy Simulation models, such as gradient assumptions. In this study, consider different test-cases Geldart type A B particles regimes with domain averaged fractions ranging from 0.05 0.25. operating conditions include unbounded sedimentation under gravity, well turbulent-sluggish fluidization. all cases, discuss influence meso-scale clusters macro-scale distributions individual unresolved terms simulations. Thereby, find leads accurate results local sinks global difference decay between phases jump-response fluidized bed an elevated gas-inflow correctly captured by proposed multi-phase model. importance correct hydrodynamics prediction thermodynamics highlighted.