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This study aimed to develop a viscosity model and improve the existing density function solving method by using the BWRS equation of state. The analysis revealed that the density function increased monotonically, so the improved dichotomy for solving density was developed. On the basis of the similarity between  P - V - T  and  T - μ - P  relationship, a viscosity model was developed. The new algorithm for solving density has a wider application scope, its calculation accuracy can satisfy the requirements. The new viscosity model could well predict the viscosity of pure propane and carbon dioxide (ADD%: 1.75 and 2.49), and that of methane–propane (ADD%: 1.5).

Application of BWRS equation of state for calculation of fluid density and viscosity