摘要
通过基于颗粒动力学的双流体模型对气固流化床进行了数值模拟,分析考察了不同曳力模型、颗粒弹性恢复系数及计算时间步长等对床内混合及气泡的影响。数值计算结果表明:采用不同气固曳力模型会得到不同的气泡直径大小;对于同一曳力模型,随着颗粒弹性恢复系数的增加,床内流态化程度会加剧,计算时间步长增加,计算所得床内气泡直径略有减小。
The numerical simulation of gas - solid flow in fluidized bed has been carried out through double fluid model based on granular dynamics, the influence of different drag force model, restitution coefficient of granular elasticity, and step length of calculated time ete upon mixing and bubbles appeared in the bed being analysed and investigated. Results of numerical calculation show that the different bubble diameter size can be obtained by using different drag force model; by using same drag force model, the fluidization level in the bed may be improved along with increase of the restinution coefficient of granular elasticity;the increase of step length in calculated time can sligbtly decrease the diameter of buhhles in the bed obtained from calculation.
出处
《热力发电》
CAS
北大核心
2008年第11期35-38,共4页
Thermal Power Generation
基金
河南省教育厅自然科学研究项目(编号2007480006)
郑州大学引进人才项目资助
关键词
气固多相流
鼓泡流化床
欧拉-欧拉模型
颗粒动力学
颗粒弹性恢复系数
gas - solid two - phase
bubhing fluidized bed
Eulerian - Eulerian model
graular dynamics
restitution coefficient of gvanular elasticity
