Numerical Study on Number Concentration of Cylindrical Particles in Gas-solid Flows
Circulating fluidization of cylindrical particles is applied in many processes, such as the combustion of biomass stalks and the drying or wetting of cut-tobacco. The fluidizing behaviors of cylindrical particles are more complicated than those of the spherical particles due to the cylindrical particles 6 degrees of freedom. To study the number concentration distribution, one of the most important characteristics of the fluidizing behaviors, a three-dimensional model based on the DSMC method, the rigid dynamics and the momentum conservation law is established in this paper. The inter-particle collision effect is also included in this model. The gas-solid flows in an actual circulating fluidized bed were simulated using the current model, and some features of number concentration distribution of cylindrical particles were obtained. It is found that, in the riser, the velocities of cylindrical particles in the near wall regions are quicker than those in the radial centre. Phenomena such as floc, migration are evident in the fluidization process. In the fluidization state, theres no dramatic change of the number concentration of cylindrical particles with the different wind entrance speeds.
cylindrical particles circulating fluidization numerical concentration three-dimensional models of cylindrical particles inter-particle collision floe migration
Jie Cai Zhengbiao Peng Xuan Wu Zhulin Yuan
Nanjing Normal University,Nanjing 210042,Jiangsu Province,RR. China Southeast University,Nanjing 210096,Jiangsu Province,ER. China
国际会议
广州
英文
988-995
2008-12-03（万方平台首次上网日期，不代表论文的发表时间）