ELONGATE COEXISTENCE CURVE AND ITS CURVILINEAR DIAMETER AS FACTORS OF GLOBAL FLUID ASYMMETRY
Journal Title: Физика аэродисперсных систем - Year 2017, Vol 0, Issue 54
Abstract
Some inconsistencies of the conventional predictive methodologies applied in the region of vapor-liquid VLE-coexistence and its criticality are considered. As a rule, they are related to the semi-empirical concept of “rectilinear diameter” accepted in the temperature-density plane. The often curved, in practice, "rectilinear diameter” of coexistence curve (CXC) is discussable in both alternative descriptions of criticality: 1) by the Ising-based (Ib-) complete scaling phenomenology and 2) by the classical van der Waals-Maxwell-Gibbs-based (Wb-) phenomenology of VLE-transition. The latter has been essentially modified by the model of fluctuational thermodynamics (FT). The new transformation of CXC-representation based on the measurable equilibrium data obtained far away from criticality is proposed in the present work. It leads to the well-established location of critical point (CP) which corresponds to the intersection between the elongate CXC depicted in the compressibility factor-density plane and its strongly curvilinear here diameter. The universality of global fluid asymmetry (GFA)- principle introduced earlier by FT-model becomes apparent in the whole temperature range of VLE-transition. The developed predictive CP-methodology can be especially useful for the set of substances in which the direct experiment on criticality is hardly realizable.
Authors and Affiliations
O. V. Rogankov, V. A. Mazur, V. V. Kalinchak, A. E. Sergeeva, V. I. Levchenko, M. V. Shvets, V. B. Rogankov
Keywords
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