关键词: 丝状颗粒, 传热模型, 离散单元法, 数值模拟

Abstract: Filamentous particle is a kind of non-spherical particles with large aspect ratio.It has been widely applied in industrial and agricultural processes.However, the heat transfer phenomenon about particles is not well understood, especially the filamentous particle.In this study, in order to describe the heat transfer process of filamentous particle, a new mathematical model based on the discrete element method was proposed through the analysis of heat transfer mechanisms.The impact heat transfer between particles, the internal heat conduction and the convection heat exchange between gas and particles were considered in this model, and then it was used to numerically study the heat transfer process of filamentous particles in a fixed bed.Comparing the mechanisms with each other, it showed that the convection heat exchange had greater contribution to the total heat transfer.In addition, the simulation results revealed some internal temperature rules in filamentous particles under different operating conditions.

Key words: filamentous particle, model of heat transfer, discrete element method, numerical simulation