Simulation numérique de la convection de Marangoni dans du Li-Br aqueux absorbant

Translated title of the contribution: Numerical simulation of Marangoni convection within absorptive aqueous Li-Br

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    The Marangoni convection effect within absorptive films can be described as the behaviour that brings the boundary between adjoining phases to relapse into a state where the interfacial free energy is minimized as a consequence of the expansion and the contraction of the regions with low and high surface tension. Thus, surface tension gradients lead to a shear stress originating a fluid motion in proximity of the interface and consequently affecting the contingent heat and mass transfer process of absorptive mixtures. However, since the mechanism by which the related transport phenomena can be enhanced has not been clearly understood, neither the upper limit to the benefit provided nor the best surfactant additive is currently known. To provide a direct term of comparison with a nearly two-dimensional apparatus, to clarify the driving force of Marangoni convection and the related transfer performance enhancement within falling film absorbers, this work formulates a numerical model of the fundamental governing equations of vapour absorption in presence of variable surface tension.

    Original languageFrench
    Pages (from-to)176-184
    Number of pages9
    JournalInternational Journal of Refrigeration
    Volume92
    DOIs
    Publication statusPublished - 2018 Aug 1

    Fingerprint

    Surface tension
    Computer simulation
    Free energy
    Shear stress
    Numerical models
    Surface active agents
    Mass transfer
    Vapors
    Heat transfer
    Fluids
    Convection

    Keywords

    • Absorptive mixture
    • Convection de Marangoni
    • Heat and mass transfer
    • Marangoni convection
    • Mélange absorbant
    • Numerical simulation
    • Simulation numérique
    • Transfert de chaleur et de masse

    ASJC Scopus subject areas

    • Building and Construction
    • Mechanical Engineering

    Cite this

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    title = "Simulation num{\'e}rique de la convection de Marangoni dans du Li-Br aqueux absorbant",
    abstract = "The Marangoni convection effect within absorptive films can be described as the behaviour that brings the boundary between adjoining phases to relapse into a state where the interfacial free energy is minimized as a consequence of the expansion and the contraction of the regions with low and high surface tension. Thus, surface tension gradients lead to a shear stress originating a fluid motion in proximity of the interface and consequently affecting the contingent heat and mass transfer process of absorptive mixtures. However, since the mechanism by which the related transport phenomena can be enhanced has not been clearly understood, neither the upper limit to the benefit provided nor the best surfactant additive is currently known. To provide a direct term of comparison with a nearly two-dimensional apparatus, to clarify the driving force of Marangoni convection and the related transfer performance enhancement within falling film absorbers, this work formulates a numerical model of the fundamental governing equations of vapour absorption in presence of variable surface tension.",
    keywords = "Absorptive mixture, Convection de Marangoni, Heat and mass transfer, Marangoni convection, M{\'e}lange absorbant, Numerical simulation, Simulation num{\'e}rique, Transfert de chaleur et de masse",
    author = "Niccolo Giannetti and Seiichi Yamaguchi and Kiyoshi Saito",
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    language = "French",
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    TY - JOUR

    T1 - Simulation numérique de la convection de Marangoni dans du Li-Br aqueux absorbant

    AU - Giannetti, Niccolo

    AU - Yamaguchi, Seiichi

    AU - Saito, Kiyoshi

    PY - 2018/8/1

    Y1 - 2018/8/1

    N2 - The Marangoni convection effect within absorptive films can be described as the behaviour that brings the boundary between adjoining phases to relapse into a state where the interfacial free energy is minimized as a consequence of the expansion and the contraction of the regions with low and high surface tension. Thus, surface tension gradients lead to a shear stress originating a fluid motion in proximity of the interface and consequently affecting the contingent heat and mass transfer process of absorptive mixtures. However, since the mechanism by which the related transport phenomena can be enhanced has not been clearly understood, neither the upper limit to the benefit provided nor the best surfactant additive is currently known. To provide a direct term of comparison with a nearly two-dimensional apparatus, to clarify the driving force of Marangoni convection and the related transfer performance enhancement within falling film absorbers, this work formulates a numerical model of the fundamental governing equations of vapour absorption in presence of variable surface tension.

    AB - The Marangoni convection effect within absorptive films can be described as the behaviour that brings the boundary between adjoining phases to relapse into a state where the interfacial free energy is minimized as a consequence of the expansion and the contraction of the regions with low and high surface tension. Thus, surface tension gradients lead to a shear stress originating a fluid motion in proximity of the interface and consequently affecting the contingent heat and mass transfer process of absorptive mixtures. However, since the mechanism by which the related transport phenomena can be enhanced has not been clearly understood, neither the upper limit to the benefit provided nor the best surfactant additive is currently known. To provide a direct term of comparison with a nearly two-dimensional apparatus, to clarify the driving force of Marangoni convection and the related transfer performance enhancement within falling film absorbers, this work formulates a numerical model of the fundamental governing equations of vapour absorption in presence of variable surface tension.

    KW - Absorptive mixture

    KW - Convection de Marangoni

    KW - Heat and mass transfer

    KW - Marangoni convection

    KW - Mélange absorbant

    KW - Numerical simulation

    KW - Simulation numérique

    KW - Transfert de chaleur et de masse

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