The critical parameters and congruent vapor-liquid diagram of ten metallic alkali and alkaline earth fluids and one H-bond organic (methanol)

Rogankov, Oleg V.; Mazur, Victor; Роганков, В. Б.

doi:10.1016/j.fluid.2017.09.020

Cited by 9 publications

(10 citation statements)

References 25 publications

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“…This result has been obtained in the present work for Ar, CO 2 , H 2 O and any other f-system without appeals to an absence of a singular CP. Moreover, the well-studied experimentally and reliably approximated by the fundamental NIST-EOS real SCF-systems are adequately described in the present work by PCS-form of [6][7][8] for SCF-region performed in terms of two actual substance-dependent PCS-criteria [8,18]: the crit-ical compressibility factor c Z and the critical Riedel's factor c Ri :…”

Section: Contours For Definition Of Ft2-region In Scf-areamentioning

confidence: 81%

“…The aim is to emphasize their principle difference, since both FT-ones: FT1 and FT2 admit the existence of heterogeneous fluctuational NGF-phases at both sub-and supercritical states. Below c T , the presence of a such subcritical NGF-phase termed the interphase was confirmed for many substances by our previous investigations [8,9,17,18]. We have used for its presence the term of congruent vapor-liquid (CVL)-diagram to distinct it from the traditional VLE-diagram constructed, exclusively, for GPhs i.e.…”

Section: Global Congruent Fluctuation Diagram Of Vdw/lj-fluid аNd Locmentioning

confidence: 89%

“…(23) They are widely discussible in the predictive ZL-methodology [13,16,18]. It is interesting to note that some authors [19] have used even the rather controversial interpretation of the standard equilibrium abbreviation PVT (physical-vapor transport) to emphasize the hypothesized dynamical nature of criticality.…”

Section: The Comparison Of Ftmentioning

confidence: 99%

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Supercritical heterogeneous nanostructure of fluids. Part 1. Diagram of fluctuation transitions in non-gibbsian phases

Роганков¹,

Швець²,

Rogankov³

et al. 2019

ФАС

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New concept of a supercritical fluid (SCF) region is proposed to recognize the set of the recent experimental observations and the numerical model results, in which the conventional asymptotic scaling theory and its crossover extension achieve the limit of applicability. An existence of the heterogeneous steady lattice-type nanostructure in the wide ranges of supercritical parameters termed the non-gibbsian fluid (NGF)-phase was hypothesized by one of authors (V.B.R.) in the framework of FT (fluctuational thermodynamics)-model. It was argued by FT-model that the similar NGF-phase exists also below the critical temperature in any real finite-volume VLE-transition. The present work establishes the location of exact boundaries for the supercritical lattice-type NGF-phase confirmed by the set of recently published experimental results and simulations. In brief, the total supercritical region consists of the dilute gas-like (gl) gibbsian (homogeneous) phase (GPh) and the dense liquid-like (ll) gibbsian (homogeneous) phase (GPh) separated one from another by the heterogeneous (at least, in nanoscales of a finite volume) vapor-like (vl) NGF-phase. The practical usage of a such structure may be quite promising in many areas of applications. It is certainly non-restricted by only the known advances of a supercritical extraction processing.

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Section: Contours For Definition Of Ft2-region In Scf-areamentioning

confidence: 81%

Section: Global Congruent Fluctuation Diagram Of Vdw/lj-fluid аNd Locmentioning

confidence: 89%

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Supercritical heterogeneous nanostructure of fluids. Part 1. Diagram of fluctuation transitions in non-gibbsian phases

Роганков¹,

Швець²,

Rogankov³

et al. 2019

ФАС

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“…Its simulated snapshots look like the certain decorated lattice with three types of nano-cells filled by gl-, ll-and ig-contents. To obtain such a supposedly inter-percolation structure we used the finite-range, well-determined by CP-parameters of a real substance LJ/FT-potential [16]. The advantage of FT-methodology is also explainable by the revealed local correlation between the density order parameter (simulated by FT-model) ∆ ρ and the specific (or molar) entropy disorder parameter s ∆ (introduced in our pervious works [17][18][19][20]).…”

Section: Introductionmentioning

confidence: 99%

“…The change of caloric vdW-functions calculated by Eqs (14)(15)(16)(17). for the entire CSH-cycle (a) and its sub-cycles I and II (b).…”

mentioning

confidence: 99%

Supercritical heterogeneous nanostructure of fluids. Part 2. Its potential impact on creation of coupled stirlings with intermediate regeneration of heat

Роганков¹,

Швець²,

Rogankov³

et al. 2019

ФАС

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Supercritical heterogeneous nanostructure of fluids. Part 2. Its potential impact on creation of coupled stirlings with intermediate regeneration of heat New concept of a supercritical fluid (SCF) region is proposed to explain the set of experimental and numerical observations in which the conventional asymptotic scaling theory and its crossover extension achieve the limit of applicability. An existence of heterogeneous steady nanostructure in the wide ranges of supercritical parameters termed the non-gibbsian fluid (NGF)-phase was hypothesized by one of authors (V.B.R.) in the framework of FT (fluctuational thermodynamics)-model. The practical usage of a such structure may be quite promising. In particular, the proposed here concept of the Coupled Supercritical Heterogeneous (CSH)-stirling engine might be, in principle, realized. It is composed by two coupled stirling-rallis type cycles with the standard regeneration devices and, additionally, with the intermediate (internal) recuperation of heat. The closed construction of both sub-cycles and of the proposed CSH-stirling, in total, is its advantage in comparison with the external forms of recuperation in the open cycles. Thus, our aim is the usage of the established NGF-properties to formulate the concept of an effective stirling-type cycle with the most appropriate working fluid SCF/CO 2 (carbon dioxide) instead of the conventional here He (helium) and H 2 (hydrogen) working fluids.

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Thermal Hysteresis of Mesoscopic Phase Transitions in Fluid and Solid Metals: Critical Point and Global Diagram of Tantalum

2022

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The critical parameters and congruent vapor-liquid diagram of ten metallic alkali and alkaline earth fluids and one H-bond organic (methanol)

Cited by 9 publications

References 25 publications

Supercritical heterogeneous nanostructure of fluids. Part 1. Diagram of fluctuation transitions in non-gibbsian phases

Supercritical heterogeneous nanostructure of fluids. Part 1. Diagram of fluctuation transitions in non-gibbsian phases

Supercritical heterogeneous nanostructure of fluids. Part 2. Its potential impact on creation of coupled stirlings with intermediate regeneration of heat

Thermal Hysteresis of Mesoscopic Phase Transitions in Fluid and Solid Metals: Critical Point and Global Diagram of Tantalum

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