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Visualization of supercritical water pseudo-boiling at Widom line crossover

Author

Listed:
  • Florentina Maxim

    (Paul Scherrer Institute
    “Ilie Murgulescu” Institute of Physical Chemistry)

  • Cristian Contescu

    (Oak Ridge National Laboratory)

  • Pierre Boillat

    (Paul Scherrer Institute
    Paul Scherrer Institute)

  • Bojan Niceno

    (Paul Scherrer Institute
    Eidgenössische Technische Hochschule Zürich (ETHZ), MAVT-LKE)

  • Konstantinos Karalis

    (Paul Scherrer Institute)

  • Andrea Testino

    (Paul Scherrer Institute)

  • Christian Ludwig

    (Paul Scherrer Institute
    École Polytechnique Fédérale de Lausanne (EPFL), ENAC IIE GR-LUD)

Abstract

Supercritical water is a green solvent used in many technological applications including materials synthesis, nuclear engineering, bioenergy, or waste treatment and it occurs in nature. Despite its relevance in natural systems and technical applications, the supercritical state of water is still not well understood. Recent theories predict that liquid-like (LL) and gas-like (GL) supercritical water are metastable phases, and that the so-called Widom line zone is marking the crossover between LL and GL behavior of water. With neutron imaging techniques, we succeed to monitor density fluctuations of supercritical water while the system evolves rapidly from LL to GL as the Widom line is crossed during isobaric heating. Our observations show that the Widom line of water can be identified experimentally and they are in agreement with the current theory of supercritical fluid pseudo-boiling. This fundamental understanding allows optimizing and developing new technologies using supercritical water as a solvent.

Suggested Citation

  • Florentina Maxim & Cristian Contescu & Pierre Boillat & Bojan Niceno & Konstantinos Karalis & Andrea Testino & Christian Ludwig, 2019. "Visualization of supercritical water pseudo-boiling at Widom line crossover," Nature Communications, Nature, vol. 10(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12117-5
    DOI: 10.1038/s41467-019-12117-5
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    Cited by:

    1. Filip Simeski & Matthias Ihme, 2023. "Supercritical fluids behave as complex networks," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. 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.
    3. 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).
    4. Daniarta, Sindu & Imre, Attila R. & Kolasiński, Piotr, 2022. "Thermodynamic efficiency of subcritical and transcritical power cycles utilizing selected ACZ working fluids," Energy, Elsevier, vol. 254(PA).

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