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

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    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.

    Original languageEnglish
    Title of host publication24th IIR International Congress of Refrigeration, ICR 2015
    PublisherInternational Institute of Refrigeration
    Pages786-793
    Number of pages8
    ISBN (Electronic)9782362150128
    DOIs
    Publication statusPublished - 2015
    Event24th IIR International Congress of Refrigeration, ICR 2015 - Yokohama, Japan
    Duration: 2015 Aug 162015 Aug 22

    Other

    Other24th IIR International Congress of Refrigeration, ICR 2015
    CountryJapan
    CityYokohama
    Period15/8/1615/8/22

    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

    Cite this

    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. In 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.

    Research output: Chapter in Book/Report/Conference proceedingConference 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. in 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. In 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
    @inproceedings{ec70ce63ba3b43e8a71bc19ffa9ba7b7,
    title = "Local entropy generation analysis of water vapour absorption in a LiBr-H2O solution film, over a horizontal cooled tube",
    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.",
    author = "Niccolo Giannetti and Andrea Rocchetti and Kiyoshi Saito and Seiichi Yamaguchi",
    year = "2015",
    doi = "10.18462/iir.icr.2015.0466",
    language = "English",
    pages = "786--793",
    booktitle = "24th IIR International Congress of Refrigeration, ICR 2015",
    publisher = "International Institute of Refrigeration",

    }

    TY - GEN

    T1 - Local entropy generation analysis of water vapour absorption in a LiBr-H2O solution film, over a horizontal cooled tube

    AU - Giannetti, Niccolo

    AU - Rocchetti, Andrea

    AU - Saito, Kiyoshi

    AU - Yamaguchi, Seiichi

    PY - 2015

    Y1 - 2015

    N2 - 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.

    AB - 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.

    UR - http://www.scopus.com/inward/record.url?scp=85016758671&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=85016758671&partnerID=8YFLogxK

    U2 - 10.18462/iir.icr.2015.0466

    DO - 10.18462/iir.icr.2015.0466

    M3 - Conference contribution

    AN - SCOPUS:85016758671

    SP - 786

    EP - 793

    BT - 24th IIR International Congress of Refrigeration, ICR 2015

    PB - International Institute of Refrigeration

    ER -