膨胀床的膨胀特性和液体混合研究  

Study on Expanding Characteristics and Liquid Mixing of Expanded-bed

作　　者：姜绍通[1] 潘丽军[1] 马道荣[1] 

机构地区：[1]合肥工业大学生物与食品工程学院

出　　处：《农业机械学报》2004年第5期140-142,151,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：高等学校骨干教师资助计划项目 (项目编号 :教技司 [2 0 0 0- 65 ])

摘　　要：通过测定示踪剂在膨胀床体内的停留时间分布 ,考察表观流速、装柱高径比、介质颗粒物性等因素对膨胀床的影响 ,并利用一维轴向扩散模型计算得到了液体轴向扩散系数。结果表明 :对于大颗粒、低密度介质的膨胀特性可用 Richardson- Zaki方程来描述 ,各因素对床体内扩散系数的影响可用无因次方程来模拟。By measuring the distribution of tracers' residence time the influences of the superficial flowing velocity of liquid, the height of bed, and the density and diameter of particles on the expanded bed behaviors were experimentally investigated. The results show that the Richardson Zaki equation can be used to describe the expanding characteristics of an expanded bed and the influences of various parameters on the bed diffusivity can be simulated by the dimensionless equations.

关 键 词：膨胀床 膨胀特性 液体 混合研究 空隙率 轴向扩散系数 加工 

分 类 号：S377[农业科学—农产品加工]