引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 7270次   下载 1319 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Self-diffusion Coefficient Model Based on Activation Energy and Free Volume
Xiao-yong Yin* ,Hai-hua Song
Author NameAffiliation
Xiao-yong Yin* School of Chemical Engineering, Tianjin University, Tianjin 300072, China 
Hai-hua Song School of Chemical Engineering, Tianjin University, Tianjin 300072, China 
Abstract:
A new model for self-diffusion coe±cients was proposed based on both the concepts of molecular free volume and activation energy. The unknown parameters of this model were clearly defined and compared with the Chapman-Enskog model. At the same time a new method for calculating activation energy was devised and applied to the new model. In addition, the free volume was defined by implementing the generic van der Waals equation of state, the radial distribution function of which was obtained by using the MorsaliGoharshadi empirical formula. Under the same conditions, the new model was better than the original free volume model.
Key words:  Free volume, Potential energy barrier, Self-diffusion coeficient, Pair correlation function
FundProject:
基于扩散势能和自由体积的自扩散系数模型
尹小勇 ,宋海华
摘要:
在考虑自由体积和局部临界扩散势能的基础上,提出一种新的 计算自扩散系数模型, 并给出新模型中各个因子物理含义. 同时还提 出一种计算局部临界扩散势能的新方法,并应用于新模型. 另外将衍 生van der Waals状态方程应用于求解自由体积,式中所需径向分布函 数由Morsali-Goharshadi方程得到. 在相同条件下,新模型比原自由 体积模型更准确.
关键词:  自由体积,局部临界扩散势能,自扩散系数,对相关函数
DOI:10.1360/cjcp2006.19(6).488.5
分类号: