Temperature measurements in a string of three closely spaced droplets before the start of puffing/micro-explosion: Experimental results and modelling

Dmitry Antonov, Roman Volkov, Roman Fedorenko, Pavel Strizhak, Gullaume Castanet, Sergei Sazhin

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    Abstract

    The results of experimental and theoretical investigation of the mutual effects of three composite Diesel fuel/water droplets, one behind the other, on their puffing/micro-explosion are presented. The analysis is focused not only on finding the time instant when puffing/micro-explosion starts, but also on the investigation of time evolution of temperature at the water-fuel interface before the development of puffing/micro-explosion. The experimentally observed temperatures at the water-fuel interface are shown to increase almost linearly with time for the lead, middle and downstream droplets. Assuming that puffing/micro-explosion starts when the temperature at this interface reaches the water nucleation temperature, the values of the latter temperature as a function of the heating rate were found from the experimental data. The results are shown to be consistent with the earlier found correlation for this temperature for all three droplets. Time to puffing/micro-explosion is shown to decrease with increasing gas temperature; this time for the lead droplet is always shorter than that of the middle and downstream droplets, and the difference between them decreases as the distance between droplets increases. The experimental results are interpreted in terms of the previously developed model based on the assumption that the water sub-droplet is located exactly in the centre of the Diesel fuel droplet and that this process is triggered when the temperature at the water/fuel interface attains the water nucleation temperature. The effect of interaction between lead, middle and downstream droplets is considered via modifications to the Nusselt (Nu) and Sherwood (Sh) numbers for these droplets due to the interaction between them.

    Original languageEnglish
    Article number121837
    Number of pages40
    JournalInternational Journal of Heat and Mass Transfer
    Volume181
    DOIs
    Publication statusPublished - 20 Aug 2021

    Bibliographical note

    Funding Information:
    The authors are grateful: to the National Research Tomsk Polytechnic University (project VIU-ISHFVP-60/2019) which supported P.A. Strizhak (who contributed to the formulation of the problem and analysis of the results) and R.S. Volkov (who contributed to the development of the experimental setup); for scholarships from the President of the Russian Federation (Grants SP-447.2021.1 and MN-7/2260) which supported D. Antonov and R. Fedorenko (who performed the experiments, applied the model to their analysis and prepared the first draft of the paper); to the Universit? de Lorraine and the Institut Carnot Ic?el for the CALICO (Combustion d'A?rosols LIquides Complexes) grant which supported G. Castanet (who contributed to the development of the model, the simulations and preparation of the text of the paper), and to the Russian Science Foundation (Grant 21-19-00876), which supported S.S. Sazhin (who contributed to the development of the model, analysis of the results and preparation of the text of the paper).

    Funding Information:
    The authors are grateful: to the National Research Tomsk Polytechnic University (project VIU-ISHFVP-60/2019) which supported P.A. Strizhak (who contributed to the formulation of the problem and analysis of the results) and R.S. Volkov (who contributed to the development of the experimental setup); for scholarships from the President of the Russian Federation (Grants SP-447.2021.1 and MN-7/2260) which supported D. Antonov and R. Fedorenko (who performed the experiments, applied the model to their analysis and prepared the first draft of the paper); to the Université de Lorraine and the Institut Carnot Icéel for the CALICO (Combustion d’Aérosols LIquides Complexes) grant which supported G. Castanet (who contributed to the development of the model, the simulations and preparation of the text of the paper), and to the Russian Science Foundation (Grant 21-19-00876), which supported S.S. Sazhin (who contributed to the development of the model, analysis of the results and preparation of the text of the paper).

    Publisher Copyright:
    © 2021 Elsevier Ltd

    Keywords

    • Composite droplets
    • puffing
    • micro-explosion
    • heating,
    • evaporation
    • droplets in a row
    • Heating
    • Micro-explosion
    • Droplets in a row
    • Evaporation
    • Puffing

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