The knowledge on the heat and mass transfer characteristics of filamentous particles in a fixed bed is preliminary.This paper describes a numerical model for microscopic heat and mass transfer mechanisms between particles and between gas and particles at particle scale.The CFD-DEM coupled approach was employed to numerical study on the local flow and transfer information in the fixed bed

which is difficult to obtain from experiment.The critical factors influencing the temperature and moisture content distribution in a fixed bed such as the air inlet temperature and superficial gas velocity were examined.The model was validated by comparing the simulation results with experimental data.It is concluded that the temperature of filamentous particles reduces and the moisture content of particles increases with the increase of bed height.The air inlet temperature plays a dominant role in the average temperature of the bed

and the mass transfer rate of filamentous particles is affected more obviously by the superficial gas velocity.