Local entropy generation analysis of water vapour absorption in a LiBr-H2O solution film, over a horizontal cooled tube

    研究成果: Conference contribution

    抄録

    This study is based on a numerical analysis of water vapour absorption in a laminar, gravity driven, viscous, incompressible liquid film of LiBr-H2O solution, flowing over a horizontal cooled tube. The hydrodynamic description is based on Nusselt boundary layer assumptions. A local entropy generation calculation can be performed referring to velocity, temperature and concentration fields. From a general form of volumetric entropy generation, a suitable expression for the absorption process has been obtained and different irreversibility sources have been highlighted. The impact of each term (fluid friction, heat transfer, mass transfer and their coupling effects) has been locally examined. Results have been explored for different tube radii, wall temperatures and operative conditions (representing both chiller and heat transformer configurations), in order to characterise the process from a second law point of view and establish a criterion for the optimisation of the absorber.

    元の言語English
    ホスト出版物のタイトル24th IIR International Congress of Refrigeration, ICR 2015
    出版者International Institute of Refrigeration
    ページ786-793
    ページ数8
    ISBN(電子版)9782362150128
    DOI
    出版物ステータスPublished - 2015
    イベント24th IIR International Congress of Refrigeration, ICR 2015 - Yokohama, Japan
    継続期間: 2015 8 162015 8 22

    Other

    Other24th IIR International Congress of Refrigeration, ICR 2015
    Japan
    Yokohama
    期間15/8/1615/8/22

    Fingerprint

    Water vapor
    water vapor
    Entropy
    entropy
    tubes
    wall temperature
    Liquid films
    transformers
    mass transfer
    numerical analysis
    Numerical analysis
    boundary layers
    absorbers
    Gravitation
    Boundary layers
    temperature distribution
    friction
    Mass transfer
    Hydrodynamics
    velocity distribution

    ASJC Scopus subject areas

    • Control and Systems Engineering
    • Electrical and Electronic Engineering
    • Mechanical Engineering
    • Condensed Matter Physics

    これを引用

    Giannetti, N., Rocchetti, A., Saito, K., & Yamaguchi, S. (2015). Local entropy generation analysis of water vapour absorption in a LiBr-H2O solution film, over a horizontal cooled tube. : 24th IIR International Congress of Refrigeration, ICR 2015 (pp. 786-793). International Institute of Refrigeration. https://doi.org/10.18462/iir.icr.2015.0466

    Local entropy generation analysis of water vapour absorption in a LiBr-H2O solution film, over a horizontal cooled tube. / Giannetti, Niccolo; Rocchetti, Andrea; Saito, Kiyoshi; Yamaguchi, Seiichi.

    24th IIR International Congress of Refrigeration, ICR 2015. International Institute of Refrigeration, 2015. p. 786-793.

    研究成果: Conference contribution

    Giannetti, N, Rocchetti, A, Saito, K & Yamaguchi, S 2015, Local entropy generation analysis of water vapour absorption in a LiBr-H2O solution film, over a horizontal cooled tube. : 24th IIR International Congress of Refrigeration, ICR 2015. International Institute of Refrigeration, pp. 786-793, 24th IIR International Congress of Refrigeration, ICR 2015, Yokohama, Japan, 15/8/16. https://doi.org/10.18462/iir.icr.2015.0466
    Giannetti N, Rocchetti A, Saito K, Yamaguchi S. Local entropy generation analysis of water vapour absorption in a LiBr-H2O solution film, over a horizontal cooled tube. : 24th IIR International Congress of Refrigeration, ICR 2015. International Institute of Refrigeration. 2015. p. 786-793 https://doi.org/10.18462/iir.icr.2015.0466
    Giannetti, Niccolo ; Rocchetti, Andrea ; Saito, Kiyoshi ; Yamaguchi, Seiichi. / Local entropy generation analysis of water vapour absorption in a LiBr-H2O solution film, over a horizontal cooled tube. 24th IIR International Congress of Refrigeration, ICR 2015. International Institute of Refrigeration, 2015. pp. 786-793
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    abstract = "This study is based on a numerical analysis of water vapour absorption in a laminar, gravity driven, viscous, incompressible liquid film of LiBr-H2O solution, flowing over a horizontal cooled tube. The hydrodynamic description is based on Nusselt boundary layer assumptions. A local entropy generation calculation can be performed referring to velocity, temperature and concentration fields. From a general form of volumetric entropy generation, a suitable expression for the absorption process has been obtained and different irreversibility sources have been highlighted. The impact of each term (fluid friction, heat transfer, mass transfer and their coupling effects) has been locally examined. Results have been explored for different tube radii, wall temperatures and operative conditions (representing both chiller and heat transformer configurations), in order to characterise the process from a second law point of view and establish a criterion for the optimisation of the absorber.",
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