Physico-chemical processes occurring inside a degrading two-dimensional anisotropic porous medium

摘要: Abstract A lumped-parameter kinetic model is applied to simulate the pyrolysis of lignocellulosic particles, exposed a high temperature environment. Physical processes account for radiative, conductive and convective heat transport, diffusion convection volatile species pressure velocity variations across two-dimensional (2-D) , anisotropic, variable property medium. The dynamics particle degradation are found be strongly affected by grain structure solid. comparison made between total transferred virgin solid (conduction minus convection) along grain. Notwithstanding lower thermal conductivities, because concomitant slower transport (lower gas permeabilities) largest contribution that role played successively less important as size increased. Finally, 2-D widely one-dimensional (1-D) predictions compared.