用链状流体分子热力学模型计算常压流体混合物的黏度  

Calculation of Viscosities of Fluid Mixtures at Atmospheric Pressure by Molecular Thermodynamic Model for Chain-Like Fluids

作　　者：周永祥[1] 彭昌军[1] 黑恩成[1] 刘洪来[1] 

机构地区：[1]华东理工大学化学系结构可控先进功能材料及其制备教育部重点实验室,上海200237

出　　处：《石油化工》2006年第11期1063-1068,共6页Petrochemical Technology

基　　金：国家自然科学基金项目(20476025;20490200);上海市重大基础研究项目(05DJ14002);上海市教委资助项目

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。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.

关 键 词：流体混合物 黏度 分子热力学模型 黏度模型 

分 类 号：TQ013[化学工程]