Comparison of Different Calculation Methods of the New Generation Geometric Model in Predicting the Density of NaCl-MgCl_2-CaCl_2 Systems

摘要

The new generation geometric model has been proposed to calculate the thermodynamic properties for multi-component systems in terms of the properties of their corresponding binaries, in which the "similarity coefficient" ξ has been introduced based on the "deviation sum of squares", η_1. This function is the key conception of the new generation geometrical model. A different η_1 function besides "deviation sum of squares" has been mentioned in the previous papers. However, discussion of the effect of η in the prediction is scarce. In this paper the density data of molten NaCl-MgCl_2-CaCl_2 systems were predicted via three different η parameters. It is found that different kinds of η functions yield different calculation results. The results show that the mean relative errors of three different η parameters were no more than 0.75 %,which is in an acceptable range. Therefore, the two methods proposed in this paper could be used for computing physi-cochemical properties. Three other η functions were also provided and discussed.