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Chapter 9 234 Predictive equations of state have been used to compute the thermodynamic properties of the mixture, most notably the fundamental derivative of gas dynamics Γ. Some of the exemplary mixtures display thermodynamic regions of negative nonlinearity for certain compositions. The dependence of the minimum value of Γ in the vapour phase from the molar composition has been analyzed for several paradigmatic mixtures, finding that Γmin is always greater than the value of Γmin of the most complex molecule in the mixture. Further, the value Γmin of a pure component whose molecular weight is intermediate with respect to that of the mixture constituents, is always lower than that of the mixture featuring the same molecular weight or complexity. For all the considered mixtures, mixing compounds of the same fluid family does not en- hance non-classical gas dynamic phenomena. Preliminary simulations of a supersonic flow of a dense vapour expanding over a corner are presented. The dense vapour is a binary mixture of linear siloxanes MDM/MD6M, whereby for each simulation the upstream conditions are kept similar, while the molar com- position is varied from xMDM = 0 to xMDM = 1. The results show how the flow field changes from the classical expansion fan to a rarefaction shock wave, when the composition is MDM(0.05)/MD6M(0.95). For MDM(0.15)/MD6M(0.85) a mixed rarefaction shock/fan is predicted. Attention will be dedicated to highly non-ideal mixtures in an attempt to understand if an enhancement of non-classical gas dynamic effects can be achieved by mixing two or more different organic fluids. This possibility—together with thermal stability—would have a large impact on experiments aimed at generating and measuring non-classical gas dynamic phenomena.PDF Image | New Concepts FOR Organic Rankine Cycle Power Systems
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