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Composite liquids under high-power heating: superheat of water in micro-explosion of water-in-fuel droplets

  • Alexey Melkikh and Pavel Skripov EMAIL logo
Published/Copyright: July 23, 2024

Abstract

The article analyses the degree of water superheating with respect to the liquid-vapour equilibrium line in experiments on the micro-explosion of a composite droplet comprised of two immiscible liquids. The analyses were carried out for water-in-fuel drops under conditions of high-power heating. This degree is compared with the mechanical effect of droplet decay, involving the formation of daughter droplets. Our attention was drawn to the smallness of the degree of superheating preceding the decay. A model of the boiling up of such a droplet is constructed taking into account the sources of premature boiling up of water inherent in micro-explosive experiments. The dependencies of the boiling up temperature of water on the heating rate obtained in the model turned out to be in accordance with the experimental data across a wide range of heating rates. A hypothesis about the local superheating of the transition layer, which is not detected in the experiment, is formulated. Thus, a step has been taken to clarify the essence of the mismatch of the degree of superheating of water recorded by macroscopic equipment along with a completely satisfactory generation of daughter droplets serving as the basis for advanced fuel technology.


Corresponding author: Pavel Skripov, Institute of Thermal Physics Ural Branch of Russian Academy Sciences, 620016, Ekaterinburg, Russia, E-mail: 

Acknowledgments

The authors are grateful to D.V. Antonov, who provided data (5) for Figure 2 and photos for Figure 5, as well as Mrs. S.Yu. Elina for her assistance in preparing the manuscript.

  1. Research ethics: Not applicable.

  2. Author contributions: Conceptualization, Alexey Melkikh and Pavel Skripov; modelling, Alexey Melkikh; validation, Alexey Melkikh; formal analysis, Pavel Skripov; writing, Alexey Melkikh and Pavel Skripov; supervision, Pavel Skripov; funding acquisition, Pavel Skripov. All authors have read and agreed to the published version of the manuscript.

  3. Competing interests: The authors declare no competing interests regarding this article.

  4. Research funding: The investigation has been conducted at the expense of a grant of the Russian Science Foundation (project No. 23-69-10006), https://rscf.ru/project/23-69-10006/.

  5. Data availability: Not applicable.

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Received: 2024-03-20
Accepted: 2024-07-08
Published Online: 2024-07-23
Published in Print: 2024-10-28

© 2024 Walter de Gruyter GmbH, Berlin/Boston

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