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Crossing the Widom-line - supercritical pseudo-boiling

Banuti, Daniel (2015) Crossing the Widom-line - supercritical pseudo-boiling. The Journal of Supercritical Fluids, 98 (03), pp. 12-16. Elsevier. DOI: 10.1016/j.supflu.2014.12.019 ISSN 0896-8446

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Official URL: http://www.sciencedirect.com/science/article/pii/S0896844614004306

Abstract

Recent publications in the open literature have shown that supercritical fluid states are not homogeneously distributed but, in fact, can be differentiated into two distinct regions with gas-like and liquid-like properties, respectively. These regions are divided by an extension of the coexistence line, commonly called Widom line. This paper shows that a supercritical analog to subcritical phase change, pseudo-boiling, does exist when crossing this demarcation. The supercritical state transition does not occur in a phase equilibrium but takes place over a finite temperature interval. While subcritical vaporization requires energy to overcome intermolecular attraction, supercritical state transitions additionally require energy to increase the temperature. It could be shown that the attractive potential is the dominant energy sink up to a reduced pressure of 1.5 for argon, nitrogen, oxygen, and water. The effect reduces with growing pressure and becomes negligible for pl_pcr > 3. Furthermore, a new equation for this Widom- or pseudo-boiling line is given. It exhibits improved accuracy over previously published equations; performing a limit analysis of the Clapeyron equation allows to express its sole parameter purely in terms of thermodynamic variables. This parameter can then be evaluated from an equation of state or from fluid data - no nonphysical fitting is required.

Item URL in elib:https://elib.dlr.de/93290/
Document Type:Article
Additional Information:Published online: 02. January 2015
Title:Crossing the Widom-line - supercritical pseudo-boiling
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Banuti, Danieldaniel.banuti (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:The Journal of Supercritical Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:98
DOI :10.1016/j.supflu.2014.12.019
Page Range:pp. 12-16
Publisher:Elsevier
Series Name:Science Direct
ISSN:0896-8446
Status:Published
Keywords:pseudoboiling, Widom-line, vaporization, Clapeyron, transcritical
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - ProTAU + Prop2020 Hochleistungstriebwerke
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Micknaus, Ilka
Deposited On:16 Jun 2015 10:51
Last Modified:08 Mar 2018 18:37

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