Improvement of heat- and mass transfer modeling for single iron particles combustion using resolved simulations

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Abstract

In this work, we use a boundary layer resolved model to improve a Lagrangian point particle model to simulate the combustion of single iron particles. By resolving the full boundary layer, mass and heat transfer are accurately modeled, including Stefan flow. Therefore, the model is suitable to improve point particle models. This work focuses on the first stage of iron combustion, which lasts up to the maximum temperature. Temperature- and composition-dependent properties are used and phase transitions from solid to liquid and liquid to gas are taken into account. The Nusselt and Sherwood correlations are investigated in conditions typical for iron particle combustion. It is found that the 1/2-film temperature is the best film rule to use to model heat- and mass transfer for iron particle combustion. The boundary layer resolved model is used to validate the point particle models. Then, the model is systematically elaborated by including a temperature-dependent particle density, slip velocity and Stefan flow. The individual and combined effect of these phenomena on the burn duration are investigated. Including all these effects decreases the time to maximum temperature by around 25%. Furthermore, it is shown that if one neglects physical phenomena like slip and Stefan flow, but uses the 1/3-film rule instead of the 1/2-film rule, errors cancel and still reasonable agreement is obtained with experiments.
Original languageEnglish
Pages (from-to)572-588
Number of pages17
JournalCombustion Science and Technology
Volume196
Issue number4
Early online date20 Jun 2022
DOIs
Publication statusPublished - 2024

Funding

We would like to thank X. Mi for his valuable feedback. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under Grant Agreement no. 884916. and Opzuid (stimulus / European Regional Development Fund) Grant agreement No. PROJ-02594. This work was supported by the H2020 European Research Council [884916]; Opzuid [PROJ-02594]. We would like to thank X. Mi for his valuable feedback. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under Grant Agreement no. 884916. and Opzuid (stimulus / European Regional Development Fund) Grant agreement No. PROJ-02594.

FundersFunder number
European Union's Horizon 2020 - Research and Innovation Framework Programme
H2020 European Research Council884916
European Regional Development FundPROJ-02594

    Keywords

    • Metal fuel
    • Nusselt and Sherwood number
    • boundary layer resolved
    • iron
    • point particle

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