【摘要】 在Eyring绝对速率理论的基础上,结合链状流体分子热力学模型,建立了一个常压流体混合物的黏度方程。该黏度方程的关键是采用了链状流体分子热力学模型,同时计算黏度方程中的压缩因子和过剩Gibbs自由能。对选择的若干常压二组分流体混合物的黏度数据的计算结果表明,采用一个与温度无关的可调参数时,黏度方程能关联二组分流体混合物的黏度数据,平均相对误差为3.18%;采用两个与温度无关的可调参数时,关联效果大幅度的改善,平均相对误差降至1.22%;采用与温度有关的可调参数时,单参数和双参数所得黏度计算结果的平均相对误差分别为2.79%和0.84%。实验结果表明,该黏度方程的预测结果稍差,误差一般为7%左右。因此,实际计算中,推荐使用与温度无关的可调参数的黏度模型。更多还原

【Abstract】 By using molecular thermodynamic model for chain-like fluid,equation for calculating viscosities of fluid mixture at atmospheric pressure was established based on Eyring’s absolute rate theory.Key of the equation is that compressibility factor and excess Gibbs free energy are simultaneously calculated by using the thermodynamic model.The calculation results for viscosities of several binary fluid mixtures showed that the equation can be used to correlate the viscosity of binary fluid mixture with one adjustable temperature-irrelevant parameter,and average relative deviation of viscosity is 3.18%. By using two adjustable temperature-irrelevant parameters,average relative deviation of calculated viscosity can lower to 1.22%.If adjustable temperature-relevant parameter is introduced,average relative deviation of calculated viscosity reaches 2.79% for one-parameter,and 0.84% for two-parameters.The relative deviation of results predicted by the model is about 7%.Therefore,the viscosity model with adjustable temperature-irrelevant parameter is recommended at present stage.更多还原