Comparison of Different Calculation Methods of the New Generation Geometric Model in Predicting the Density of NaCl–MgCl2–CaCl2 Systems

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”, η1. This function is the key conception of the new generation geometrical model. A different η 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–MgCl2–CaCl2 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 physicochemical properties. Three other η functions were also provided and discussed.