摘要
为了研究降膜结晶过程的相变耦合传热传质过程 ,在混合物理论和实验观察所得的结晶形态及形貌特征的基础上建立了描述降膜结晶过程动量、热量和质量传递的数值模拟模型。该模型的一个重要特点是认为在降膜结晶过程中在熔体液相区和固相区之间存在一薄厚不匀且不断变化的二相区。以二元透明有机熔体 (萘硫茚 )为例 ,针对实验单管降膜结晶器的实际降膜结晶过程动量、热量和质量传递过程进行了数值模拟 ,所得结果在未引入任何经验常数下 。
Mixture theory and experimental crystal morphology were used to develop a numerical continuum model describing momentum, heat and species transport phenomena occurring during the falling film crystallization process. One distinct characteristic of the present model is that there is a irregular two phase region existing between the liquid and solid phases. The continuum model was used to numerically simulate the coupled momentum, heat and species transport phenomena occurring in falling film crystallization (FFC) of a binary system of naphthalene and thionaphthene. The predicted total crystallization quantity and the naphthalene content in the crystals agree well with experimental data. The experimental and numerical results show that during FFC, crystals form and grow with a wide two phase region between the outside melt and the crystal. The present continuum model can be easily applied to solid liquid phase change problems with irregular inner free interfaces.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2000年第12期82-85,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目! (5 9876 0 0 4)
