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Chapter 1 The composition of the mixture is therefore a new relevant variable in the study of BZT fluids, and, importantly, such mixtures are also considered as work- ing fluids for ORC power systems, one of the possible applications of non-classical gas dynamics. A predictive thermodynamic model is used to compute the relevant mixture properties, including its critical point coordinates and the local value of Γ. The considered model is the improved Peng-Robinson Stryjek-Vera cubic equation of state, complemented by the Wong-Sandler mixing rules. A finite thermodynamic region is found where the non-linearity parameter Γ is negative, and therefore non- classical gas dynamics phenomena are admissible. A non-monotone dependence of Γ on the mixture composition is observed in the case of binary mixtures of siloxane and perfluorocarbon fluids, with the minimum value of Γ in the mixture being always larger than that of its more complex component. The observed dependence indicates that non-ideal mixing has a strong influ- ence on the gas dynamics behaviour—either classical or non-classical—of the mixture. Numerical experiments of the supersonic expansion of a mixture flow around a sharp corner show the transition from the classical configuration, exhibit- ing an isentropic rarefaction fan centred at the expansion corner, to non-classical ones, including mixed expansion waves and rarefaction shock waves, if the mix- ture composition is changed. 8PDF Image | New Concepts FOR Organic Rankine Cycle Power Systems
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