化工学报2019，Vol.70Issue(5)：1682-1692,11.DOI:10.11949/j.issn.0438-1157.20190016
基于EMMS介尺度模型的双分散鼓泡流化床的模拟
Numerical investigation of bubbling fluidized bed with binary particle mixture using EMMS mesoscale drag model
摘要
Abstract
Gas-solid bubbling fluidized beds have various industrial applications. The particles involved in practical applications usually display polydisperse characteristics (having different diameter or densities), resulting in segregation phenomena and consequently influencing flow hydrodynamics and reaction performance. Particle separation and mixing are inseparable from bubble motion, where interphase drag plays a key role. Recently, Ahmad et al. proposed a bubble-based mesoscale drag considering the effect of bidisperse features which is able to predict the bed expansion of binary bubbling fluidized beds. In this study, in order to investigate the applicability of the new drag model, two bubbling fluidized beds with different binary particle mixtures are simulated using the combination of the new drag model and the continuum model. Then, the bubble motion and axial profiles of jetsam volume ratio under two different fluidization states are mainly analyzed. It is found that the new drag model can predict well the particle segregation and mixing behaviors when the binary particles are fluidized completely. However, when the binary particles are fluidized at the transition state, the new drag model shows poor predictions, and the solid-solid drag plays a notable role in improving the prediction.关键词
双分散颗粒/流化床/介尺度/曳力/计算流体力学/EMMSKey words
binary particle mixture/fluidized bed/mesocale/drag/CFD/EMMS分类
化学化工引用本文复制引用
佟颖,Ahmad Nouman,鲁波娜,王维..基于EMMS介尺度模型的双分散鼓泡流化床的模拟[J].化工学报,2019,70(5):1682-1692,11.基金项目
国家自然科学基金项目(21576263,21625605,91834302) （21576263,21625605,91834302）
中国科学院洁净能源先导科技专项(XDA21030700) （XDA21030700）
中国科学院青年创新促进会项目(2015033) （2015033）
