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/content/aip/journal/adva/1/4/10.1063/1.3650703
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http://aip.metastore.ingenta.com/content/aip/journal/adva/1/4/10.1063/1.3650703
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/content/aip/journal/adva/1/4/10.1063/1.3650703
2011-10-03
2016-12-09

Abstract

The main objective of this article is to study the nature of the Andrews critical point in the gas-liquid transition in a physical-vapor transport (PVT) system. A dynamical model, consistent with the van der Waals equation near the Andrews critical point, is derived. With this model, we deduce two physical parameters, which interact exactly at the Andrews critical point, and which dictate the dynamic transition behavior near the Andrews critical point. In particular, it is shown that 1) the gas-liquid co-existence curve can be extended beyond the Andrews critical point, and 2) the transition is first order before the critical point,second-order at the critical point, and third order beyond the Andrews critical point. This clearly explains why it is hard to observe the gas-liquid phase transition beyond the Andrews critical point. Furthermore, the analysis leads naturally the introduction of a general asymmetry principle of fluctuations and the preferred transition mechanism for a thermodynamic system. The theoretical results derived in this article are in agreement with the experimental results obtained in (K. Nishikawa and T. Morita, Fluid behavior at supercritical states studied by small-angle X-ray scattering, Journal of Supercritical Fluid, 13 (1998), pp. 143-148). Also, the derived second-order transition at the critical point is consistent with the result obtained in (M. Fisher, Specific heat of a gas near the critical point, Physical Review, 136:6A (1964), pp. A1599-A1604).

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