摘要
采用液固二相分区域统一模型 ,以二元有机熔体 (萘 -硫茚 )为例 ,对实验管式降膜结晶器的动量、热量和质量传递过程进行了数值模拟 ,获得了液相区和固相区随时间的变化和枝晶状液固两相区内固相含量的变化及全场温度分布以及主组分萘分布及流场速度分布随时间的变化 .由积分得到的结晶层厚度及萘纯度与相应的实验数据进行了比较 ,所得结果在未引入任何经验常数的条件下与实验结果符合较好 .
A newly developed two-phase,multi-region continuum model is used to numerically simulate the coupled momentum,heat and mass transport phenomena occurring in Falling Film Crystallization of binary organic melt of naphthalene and thionaphthene.Basically the predicted total crystallization quantity and the naphthalene contents in the crystal are in good agreement with the experimental ones.The numerical results reveal that during Falling Film Crystallization process a crystal layer is formed and grows up,accompanyed by a wide mushy region growing between outside melt and the crystal layer.The present continuum model can be easily and well used in treating the solid-liquid phase change problems with irregular inner free interface.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2001年第7期587-592,共6页
CIESC Journal
基金
国家自然科学基金资助项目 (No .598760 0 4 )&&
关键词
降膜结晶
液固二相分区连续介质
传热
传质
数值模拟
分离
动量传递
falling film crystallization,liquid-solid two-phase multi-region continuum model,heat and mass transfer,numerical simulation
