CAJ | 학술논문

建立粘附性颗粒气固两相双流体模型，依据粘附性颗粒碰撞动力学，推导固相粘度系数和聚团压力等物性参数，并采用力平衡模型估算聚团当量直径。模拟流化床内粘附性颗粒聚团流动特性，结果表明，床内流动为S型环核流动结构，大聚团主要聚集在床层底部高浓度区，上部稀相区，聚团直径较小。应用shnnon信息熵分析粘附性颗粒流动的混沌特性，得出在床层上部，聚团碰撞较剧烈。
건립점부성과립기고량상쌍류체모형，의거점부성과립팽당동역학，추도고상점도계수화취단압력등물성삼수，병채용력평형모형고산취단당량직경。모의류화상내점부성과립취단류동특성，결과표명，상내류동위S형배핵류동결구，대취단주요취집재상층저부고농도구，상부희상구，취단직경교소。응용shnnon신식적분석점부성과립류동적혼돈특성，득출재상층상부，취단팽당교극렬。
Flow behavior of cohesive particle agglomerations in CFB was numerically studied by means of a two-fluid flow model considering dynamics of collision between cohesive particles. The model of particle viscos-ity and pressure of particle agglomerations were proposed,and the size of agglomerations was estimated by mod-el proposed by Zhou(1998) from force balance acting on an agglomerations. The results of simulation showed that the flow behavior of cohesive particle agglomerations was the annulus-dense core flow structure of “S”type. The big particle agglomerations mainly appeared in the bottom of riser and walls. While the small particle agglomerations appeared in dilute regime of center of riser. The chaotic characteristics of the flow behavior of cohesive particles were analyzed using by Shannon entropy. The result show in upper bed, the collisions between agglomerations were tempestuousness.