Table of Contents
Journal of Thermodynamics
Volume 2011, Article ID 194353, 5 pages
http://dx.doi.org/10.1155/2011/194353
Research Article

Structural Transition in Supercritical Fluids

Russian New University, Radio Street 22, Moscow 105005, Russia

Received 1 July 2011; Accepted 25 July 2011

Academic Editor: Fernando García-Sànchez

Copyright © 2011 Boris I. Sedunov. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The extension of the saturation curve 𝑃 𝑠 ( 𝑇 ) on the PT diagram in the supercritical region for a number of monocomponent supercritical fluids by peak values for different thermophysical properties, such as heat capacities 𝐢 𝑝 and 𝐢 𝑣 and compressibility has been studied. These peaks signal about some sort of fluid structural transition in the supercritical region. Different methods give similar but progressively diverging curves 𝑃 s t ( 𝑇 ) for this transition. The zone of temperatures and pressures near these curves can be named as the zone of the fluid structural transition. The outstanding properties of supercritical fluids in this zone help to understand the physical sense of the fluid structural transition.