Numerical determination of the volumetric heat transfer coefficient in fixed beds of wood chips

The aim of this work is to build CFD tools study heat transfer in packed beds during the thermochemical upgrading process woody biomass. For that purpose, a numerical workflow capable investigating phenomena inside bed was developed. First, generated using Discrete Element Method (DEM) code. Then, steady-state Direct Numerical Simulation (DNS) solver used acquire flow patterns pores bed. Finally, equation solved for particles and fluid coupled manner. results are thoroughly validated against two benchmark cases: around sphere through spheres. importance accounting internal resistance substrates with high Biot number (e.g. wood) highlighted. Furthermore, torrefied wood chips investigated. Values coefficient also provided (?5 W/m2/K, Re ¡ 5, 7.7 = 10). Another interesting finding effect channeling type its impact on temperature field chips.