NUMERICAL MODELING OF COUPLED MOMENTUM,HEAT AND MASS TRANSPORT IN FALLING FILM CRYSTALLIZATION PROCESS(Ⅰ) CONTINUUM MODEL

ZHANG Zheng; ZHANG Jianwen

您当前的位置：

首页 >

文章列表页 >

NUMERICAL MODELING OF COUPLED MOMENTUM,HEAT AND MASS TRANSPORT IN FALLING FILM CRYSTALLIZATION PROCESS(Ⅰ) CONTINUUM MODEL

更新时间：2025-12-10

- NUMERICAL MODELING OF COUPLED MOMENTUM,HEAT AND MASS TRANSPORT IN FALLING FILM CRYSTALLIZATION PROCESS(Ⅰ) CONTINUUM MODEL
- CIESC Journal Issue 7, (2001)
- 作者机构：
  
  北京化工大学化学工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 July 2001，
  
  Published：25 July 2001
- 稿件说明：
移动端阅览
ZHANG Zheng, ZHANG Jianwen. NUMERICAL MODELING OF COUPLED MOMENTUM,HEAT AND MASS TRANSPORT IN FALLING FILM CRYSTALLIZATION PROCESS(Ⅰ) CONTINUUM MODEL[J]. CIESC Journal, 2001, (7).
DOI：

ZHANG Zheng, ZHANG Jianwen. NUMERICAL MODELING OF COUPLED MOMENTUM,HEAT AND MASS TRANSPORT IN FALLING FILM CRYSTALLIZATION PROCESS(Ⅰ) CONTINUUM MODEL[J]. CIESC Journal, 2001, (7). DOI：

摘要

基于混合物理论和实验观察所获得的有关结晶形态及形貌特征

建立了描述降膜结晶过程液相区、枝晶状固液两相共存区及固相区的动量、热量和质量传递过程的分区域统一数学模型 .模型的一个重要特点是认为在降膜结晶过程中

于熔体液相区和固相区之间存在一薄厚不匀且不断变化的固液两相共存区 .随着结晶过程的进行

二相区内固相体积分数不断增加并不断向液相区推移直至完全固化 .二相区的存在为降膜结晶时含杂质低纯度液体提供了在晶层内栖身的场所

这可能是产生杂质包藏的实际原因。引入多孔介质传递理论并采用Brinkman扩展的非稳态Darcy方程来描述固液两相区多孔介质内的流体流动 .进一步

采用VanDriest修正的Prandtl混合长度模型来描述降膜结晶过程中液体区的湍流流动与传热传质

Abstract

Based on mixture theory and experimental crystal morphology

a numerical continuum model describing momentum

heat and mass transport phenomena occurring during Falling Film Crystallization Process is set up.One distinct characteristic of the present model is that there is an irregular two-phase mushy region existing between the liquid and solid phases.With Falling Film Crystallization going on

the solid fraction within the mushy region keeps increasing until complete solidification and the mushy region as well as solid region keeps in growing into the liquid region

The mushy region provides various locations for impure inclusion

which may be one of the practical reason for inclusion occurring.In order to model the coupled momentum

heat and mass transport in porous mushy region

the theory of transport phenomena in porous media is introduced and unsteady Darcy equation with Brinkman extension is adopted.Further more

Van Driest-modified Prandtl’s mixing length model is used to reflect the turbulent transport phenomena occuring in the liquid region.

关键词

Keywords

references

Views

230

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Research on the characterization of the molecular weight and its distribution of perfluoropolyether

Engineering verification and NO emission control of rare earth Y2O3-based catalytic coatings on a metal fiber surface burner

Thermodynamic study of germanium-impurity competitive deposition in GeCl4-MxCly-H2 system

Thermo-oxidative degradation characteristics of TPT backsheet from end-of-life photovoltaic modules

Recent advances and perspectives on sulfide-based photocatalysts for hydrogen production

Related Author

No data

Related Institution

No data

⁰