化工计算传质学的一个改进模型  

Modified model of computational mass transfer in chemical engineering

作　　者：孙志民[1] 袁希钢[1] 刘春江[1] 余国琮[1] 

机构地区：[1]化学工程联合国家重点实验室(天津大学)天津大学化工学院,天津300072

出　　处：《南京工业大学学报（自然科学版）》2006年第1期5-10,共6页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学金资助(20136016)

摘　　要：计算传质学模型由浓度输运方程及其封闭方程和相应的计算流体力学模型组成。使用这一模型可同时计算出湍流传质扩散系数、三维浓度场和速度场分布。但刘伯潭提出的传质封闭方程c2-cε模式,形式复杂而且其模型常数均直接借鉴于传热研究;此外,由于计算流体力学模型对最终浓度场的预测结果有着重要的影响,所以有对其进一步改进的必要。文中对传质封闭方程进行了简化并重新确定了模型常数,而且对计算流体力学模型进行了改进使其预测结果与文献中的实验值符合得更好。通过与文献中的湍流传质扩散系数及浓度值的比较,证明了这一简化的可行性。The Computational Mass Transfer （CMT） model is composed of the basic differential mass transfer equation, closing with auxiliary equations and the appropriate accompanying CFD formulation. By this model, the turbulent mass transfer diffusivity, the three-dimensional velocity/concentration profiles and the efficiency of chemical equipment can be predicted simultaneously. In the present CMT model, the mass transfer equation is closed by thec^2^--εc model equations. Since the original form of such a model is complicated and the computation is tedious, asimplified model is proposed. In the same time, the accompanied CFD equation is improved for better velocity fieldprediction. To test the validity of the simplified model, the computed results are compared with the experimentaldata from literatures and good agreement is obtained.

关 键 词：c^2^--εc模型 湍流传质扩散系数 模拟 筛板塔 

分 类 号：TQ028.1[化学工程]