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Widom line and dynamical crossovers as routes to understand supercritical water

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  • P. Gallo

    (Universita’ Roma Tre)

  • D. Corradini

    (Boston University
    Present address: Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, Paris, France; CNRS, UMR 8234, PHENIX, Paris, France)

  • M. Rovere

    (Universita’ Roma Tre)

Abstract

Supercritical water is fundamental in many fields of applications and a precise characterization of the supercritical state is of uttermost importance for this liquid. In a fluid, when moving from the critical point into the single-phase region, the thermodynamic response functions show maxima reminiscent of the critical divergence. Here we study the thermodynamic properties of water in the supercritical region by analysing both available experimental data and our computer simulation results. We find that the lines connecting the maxima of the response functions converge on approaching the critical point in a single line, the Widom line. We further show that the Widom line coincides with a crossover from a liquid-like to a gas-like behaviour clearly visible in the transport properties. These thermodynamic and dynamic features show that the supercritical state in water is far more complex than what was so far believed, indicating a new perspective in the characterization of the thermodynamics of this state.

Suggested Citation

  • P. Gallo & D. Corradini & M. Rovere, 2014. "Widom line and dynamical crossovers as routes to understand supercritical water," Nature Communications, Nature, vol. 5(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6806
    DOI: 10.1038/ncomms6806
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    Cited by:

    1. Umbertoluca Ranieri & Ferdinando Formisano & Federico A. Gorelli & Mario Santoro & Michael Marek Koza & Alessio De Francesco & Livia E. Bove, 2024. "Crossover from gas-like to liquid-like molecular diffusion in a simple supercritical fluid," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. Fan, Y.H. & Tang, G.H. & Sheng, Q. & Li, X.L. & Yang, D.L., 2023. "S–CO2 cooling heat transfer mechanism based on pseudo-condensation and turbulent field analysis," Energy, Elsevier, vol. 262(PA).
    3. Florentina Maxim & Iuliana Poenaru & Elena Ecaterina Toma & Giuseppe Stefan Stoian & Florina Teodorescu & Cristian Hornoiu & Speranta Tanasescu, 2021. "Functional Materials for Waste-to-Energy Processes in Supercritical Water," Energies, MDPI, vol. 14(21), pages 1-23, November.
    4. Sajad Jafari & Hesham Gaballa & Chaouki Habchi & Jean-Charles de Hemptinne, 2021. "Towards Understanding the Structure of Subcritical and Transcritical Liquid–Gas Interfaces Using a Tabulated Real Fluid Modeling Approach," Energies, MDPI, vol. 14(18), pages 1-38, September.

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