期刊文献+

The Simulations of Annulus-Core Structure in CFB 被引量:4

The Simulations of Annulus-Core Structure in CFB
下载PDF
导出
摘要 In this paper, the stochastic particle-trajectory model is proposed for simulating the dynamic behavior of circulating fluidized bed (CFB). In our model, the motion of solid phase is obtained by calculating the individual particle trajectory while gas flow is obtained by solving the Navier-Stokes Equation including two-phase interaction. For the calculation of solid phase, the motion of each particle is decomposed into a collision process and a suspension process. In suspension process, the less important and/or unclear forces are described as a random force considering gravity, drag force and pressure gradient. As a result, the proposed model gives some numerical simulations of CFB. It indicates that the stochastic particle-trajectory model can be used to simulate qualitatively the annulus-core structure of CFB and the influences of stochastic factors cannot be ignored. In a CFB, the coupling of stochastic factors between two phases makes the radial voidage decreased. Moreover, the upward motion of particles is mitigated by both stochastic factors and turbulence between two phases. In this paper, the stochastic particle-trajectory model is proposed for simulating the dynamic behavior of circulating fluidized bed (CFB). In our model, the motion of solid phase is obtained by calculating the individual particle trajectory while gas flow is obtained by solving the Navier-Stokes Equation including two-phase interaction. For the calculation of solid phase, the motion of each particle is decomposed into a collision process and a suspension process. In suspension process, the less important and/or unclear forces are described as a random force considering gravity, drag force and pressure gradient. As a result, the proposed model gives some numerical simulations of CFB. It indicates that the stochastic particle-trajectory model can be used to simulate qualitatively the annulus-core structure of CFB and the influences of stochastic factors cannot be ignored. In a CFB, the coupling of stochastic factors between two phases makes the radial voidage decreased. Moreover, the upward motion of particles is mitigated by both stochastic factors and turbulence between two phases.
出处 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2004年第1期27-32,共6页 中国化学工程学报(英文版)
基金 Supported by the National Natural Science Foundation of China (No. 29976024) Natural Science Foundation of Shaanxi Province (No. 2001SL12) Research Foundation of Multi-Phase Reaction Laboratory in Chinese Academy of Sciences.
关键词 simulation two-phase flow particle-trajectory model FLUIDIZATION random force 循环沸腾床 模拟 液化 环面-核结构
  • 引文网络
  • 相关文献

参考文献1

二级参考文献3

  • 1JinghaiLi,,KwaukM.Partide-Fluid Two-Phase Flow--the Energy Minimization Multi-Scale Method[]..1994
  • 2Sommerfeld,M.Modelling of particle-wall collisions unconfined gas-particle flows, Int[].Japanese Journal of Multiphase Flow.1992
  • 3Sun Guogang.Heterogeneity of Gas-solid Two-phase Flow in Circulating Fluidized Beds[]..1998

同被引文献39

引证文献4

二级引证文献35

;
使用帮助 返回顶部