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根据分子间摩擦系数与组分自扩散系数关系,提出一个新的互扩散系数模型。模型分为3部分：组成项、自扩散系数和化学势与组分关系。采用文献自扩散系数值,并用不同状态方程以计算化学势与组分关系,模拟1 132～1 810℃之间不同组成二氧化碳气体混合物的互扩散系数,并与实验值做了比较。结果表明采用Peng-Robinson(PR),Redlich-Kwong(RK)及Van der Waals(VdW)方程计算化学势与组分关系而得到的模拟结果优于Virial方程,且平均误差在5%之内。
According to the relationship between the intermolecular friction coefficient and self-diffusion coefficient, a new inter-diffusion coefficient model is proposed. The model is divided into three parts: composition, self-diffusion coefficient and chemical potential and composition relationship. The literature self-diffusion coefficient values were used and the relationship between chemical potential and composition was calculated using different state equations to simulate the interdiffusion coefficient of carbon dioxide gas mixture with different composition between 1 132 and 1 810 ℃. The results show that the simulation results obtained by using Peng-Robinson (PR), Redlich-Kwong (RK) and Van der Waals (VdW) equations to calculate chemical potential and composition are better than Virial equation and the average error is within 5%.