The effect of low-concentration inorganic materials on the behaviour of supercritical water

Imre, Attila R.; Házi, Gábor; Horváth, Ákos; Maráczy, Cs.; Mazur, Victor; Artemenko, Sergey

doi:10.1016/j.nucengdes.2010.11.011

Cited by 8 publications

(5 citation statements)

References 22 publications

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“…Widom lines have also been observed in magnetic phase transitions 31 as well as in miscible isotopic mixtures 30 . Previous studies show that impurities shift the location of the Widom line in supercritical CO 2 32 and H 2 O 33 .…”

Section: Introductionmentioning

confidence: 93%

Widom Lines in Binary Mixtures of Supercritical Fluids

Raju

Banuti

Peter

et al. 2017

Sci Rep

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Recent experiments on pure fluids have identified distinct liquid-like and gas-like regimes even under supercritical conditions. The supercritical liquid-gas transition is marked by maxima in response functions that define a line emanating from the critical point, referred to as Widom line. However, the structure of analogous state transitions in mixtures of supercritical fluids has not been determined, and it is not clear whether a Widom line can be identified for binary mixtures. Here, we present first evidence for the existence of multiple Widom lines in binary mixtures from molecular dynamics simulations. By considering mixtures of noble gases, we show that, depending on the phase behavior, mixtures transition from a liquid-like to a gas-like regime via distinctly different pathways, leading to phase relationships of surprising complexity and variety. Specifically, we show that miscible binary mixtures have behavior analogous to a pure fluid and the supercritical state space is characterized by a single liquid-gas transition. In contrast, immiscible binary mixture undergo a phase separation in which the clusters transition separately at different temperatures, resulting in multiple distinct Widom lines. The presence of this unique transition behavior emphasizes the complexity of the supercritical state to be expected in high-order mixtures of practical relevance.

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Section: Introductionmentioning

confidence: 93%

Widom Lines in Binary Mixtures of Supercritical Fluids

Raju

Banuti

Peter

et al. 2017

Sci Rep

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“…One of the properties relevant in this case of the change of solubility of corrosion products in the supercritical region [9][10][11]. With some simplification, one can say that while the subcritical water is good solvent for inorganic and bad solvent for organic materials, it turns into the opposite in the SC region, it could dissolve several organic materials but could not dissolve or hardly dissolve some inorganic ones.…”

Section: The Miscibility Of Corrosion Productsmentioning

confidence: 99%

“…Even this small amount can shift the aforementioned extrema a little bit. This shift can cause measurable differences for between the expected and real quantities at a given temperature [11]. Since the miscibility behavior of various oxides in the supercritical region is not well-known and additionally we proper equation of state of these solutions do not exist, in most cases, -at least concerning thermal and flow-related problems -salty water can be used as a model.…”

Section: The Miscibility Of Corrosion Productsmentioning

confidence: 99%

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Investigation of Corrosion Resistance of Alloys with Potential Application in Supercritical Water-cooled Nuclear Reactors

Horváth

Imre

Jákli

2019

Period. Polytech. Chem. Eng.

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The Supercritical Water Cooled Reactor (SCWR) is one of the Generation IV reactor types, which has improved safety and economics, compared to the present fleet of pressurized water reactors. For nuclear applications, most of the traditional materials used for power plants are not applicable, therefore new types of materials have to be developed. For this purpose corrosion tests were designed and performed in a supercritical pressure autoclave in order to get data for the design of an in-pile high temperature and high-pressure corrosion loop. Here, we are presenting some results, related to corrosion resistance of some potential structural and fuel cladding materials.

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“…From the known results [21], it follows that impurities shift the location of the Widom delta in supercritical CO 2 [22] and H 2 O fluids [23]. Such investigations were carried out for several individual substances, such as CO 2 [24][25][26][27][28], O 2 [29], Ar [7,30], and H 2 O [31], as well as mixtures of noble gases.…”

Section: Introductionmentioning

confidence: 99%

The Anomalous Behavior of Thermodynamic Parameters in the Three Widom Deltas of Carbon Dioxide-Ethanol Mixture

Mareev

Sviridov

Gordienko

2021

IJMS

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Using molecular dynamics, we demonstrated that in the mixture of carbon dioxide and ethanol (25% molar fraction) there are three pronounced regions on the p-T diagram characterized by not only high-density fluctuations but also anomalous behavior of thermodynamic parameters. The regions are interpreted as Widom deltas. The regions were identified as a result of analyzing the dependences of density, density fluctuations, isobaric thermal conductivity, and clustering of a mixture of carbon dioxide and ethanol in a wide range of pressures and temperatures. Two of the regions correspond to the Widom delta for pure supercritical carbon dioxide and ethanol, while the third region is in the immediate vicinity of the critical point of the binary mixture. The origin of these Widom deltas is a result of the large mixed linear clusters formation.

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The effect of low-concentration inorganic materials on the behaviour of supercritical water

Cited by 8 publications

References 22 publications

Widom Lines in Binary Mixtures of Supercritical Fluids

Widom Lines in Binary Mixtures of Supercritical Fluids

Investigation of Corrosion Resistance of Alloys with Potential Application in Supercritical Water-cooled Nuclear Reactors

The Anomalous Behavior of Thermodynamic Parameters in the Three Widom Deltas of Carbon Dioxide-Ethanol Mixture

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