化工学报2013，Vol.64Issue(2)：490-497,8.DOI:10.3969/j.issn.0438-1157.2013.02.012
外加电场下气固流化床的数值模拟
Numerical simulation of gas-solids fluidized bed with applied electric field
摘要
Abstract
Obvious electrostatic effects are commonly found in industrial fluidized bed, which influences the hydrodynamics of fluidized bed and causes security risks constantly. However, the application of external electric field can 'turn harm into benefit' . In order to investigate the hydrodynamics of gas-solids fluidized bed with applied electric field, CFD simulation coupled with the electrostatic model was carried out. Through a decoupling method, the axial electrostatic potentials profiles and particle movements in the fluidized bed were investigated. The simulations presented a Z-shaped axial profile of potential in traditional fluidized bed, which was in good agreement with the experimental data. With the application of direct current (DC) electric field, the simulations showed that the region of positive potential expanded obviously, whilst the region of negative potential was also spread. Under DC electric field, the assembling of small particles was weakened near the wall, but aggregation of small particles appeared near the central electrode. By using AC electric field, the concentration of small particles near the wall was slightly lower than that in the normal fluidized bed. According to the mean electric field distribution produced by charged particles in AC field, it was observed that the electrostatic field had different directions. In the region near the distribution plate, the electrostatic field directed towards the center, while in the region near the bed level, the direction of electrostatic field headed towards the wall.关键词
气固流化床/计算流体力学/静电/外加电场Key words
gas-solids fluidized bed/CFD/electrostatic/applied electric field分类
化学化工引用本文复制引用
朱子川,孙婧元,黄正梁,王靖岱,阳永荣..外加电场下气固流化床的数值模拟[J].化工学报,2013,64(2):490-497,8.基金项目
国家自然科学基金项目(21176207) （21176207）
国家重点基础研究发展计划项目(2012CB720500) （2012CB720500）
中央高校基本科研业务费专项资金项目(2011QNA4032) （2011QNA4032）
2011年度高等学校博士学科点专项科研基金项目(20110101120020). （20110101120020）
