Abstract

The determination of thermodynamic properties frequently requires accurate numerical techniques for arriving at interpolated values of a function of two variables and for obtaining differentiated properties at interpolation points. The paper introduces a novel numerical method, the so-called “spline-fit” and shows its utility in the handling of thermodynamic data. Illustrations are provided for the case of equilibrium dissociated and ionized air, where differentiated state properties (such as specific heats and the sound velocity) are computed. An evaluation of procedures for second derivatives is also presented.

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