• Login
    View Item 
    •   UCrea
    • UCrea Investigación
    • Departamento de Ingeniería Eléctrica y Energética (DIEE)
    • D19 Artículos
    • View Item
    •   UCrea
    • UCrea Investigación
    • Departamento de Ingeniería Eléctrica y Energética (DIEE)
    • D19 Artículos
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Thermodynamic temperatures of high-temperature fixed points: uncertainties due to temperature drop and emissivity

    View/Open
    ThermodynamicTempera ... (1.125Mb)
    Identificadores
    URI: http://hdl.handle.net/10902/9741
    DOI: 10.1007/s10765-014-1677-2
    ISSN: 0195-928X
    ISSN: 1572-9567
    Compartir
    RefworksMendeleyBibtexBase
    Estadísticas
    View Usage Statistics
    Google Scholar
    Full record
    Show full item record
    Author
    Castro Alonso, Pablo BernardoAutoridad Unican; Machin, Graham; Bloembergen, Pieter; Lowe, Dave; Whittam, Aaron
    Date
    2014-07
    Derechos
    © Springer. The final publication is available at Springer via https://doi.org/10.1007/s10765-014-1677-2
    Publicado en
    International Journal of Thermophysics, 2014, 35(6), 1341–1352
    Publisher
    Springer
    Enlace a la publicación
    https://doi.org/10.1007/s10765-014-1677-2
    Palabras clave
    Emissivity
    Eutectics
    High-temperature fixed point (HTFP)
    Temperature drop
    Abstract:
    This study forms part of the European Metrology Research Programme project implementing the New Kelvin to assign thermodynamic temperatures to a selected set of high-temperature fixed points (HTFPs), Cu, Co–C, Pt–C, and Re–C. A realistic thermal model of these HTFPs, developed in finite volume software ANSYS FLUENT, was constructed to quantify the uncertainty associated with the temperature drop across the back wall of the cell. In addition, the widely applied software package, STEEP3 was used to investigate the influence of cell emissivity. The temperature drop, ΔT, relates to the temperature difference due to the net loss of heat from the aperture of the cavity between the back wall of the cavity, viewed by the thermometer, defining the radiance temperature, and the solid–liquid interface of the alloy, defining the transition temperature of the HTFP. The actual value of ΔT can be used either as a correction (with associated uncertainty) to thermodynamic temperature evaluations of HTFPs, or as an uncertainty contribution to the overall estimated uncertainty. In addition, the effect of a range of furnace temperature profiles on the temperature drop was calculated and found to be negligible for Cu, Co–C, and Pt–C and small only for Re–C. The effective isothermal emissivity (εeff) is calculated over the wavelength range from 450 nm to 850 nm for different assumed values of surface emissivity. Even when furnace temperature profiles are taken into account, the estimated emissivities change only slightly from the effective isothermal emissivity of the bare cell. These emissivity calculations are used to estimate the uncertainty in the temperature assignment due to the uncertainty in the emissivity of the blackbody.
    Collections to which it belong
    • D19 Artículos [76]

    UNIVERSIDAD DE CANTABRIA

    Repositorio realizado por la Biblioteca Universitaria utilizando DSpace software
    Contact Us | Send Feedback
    Metadatos sujetos a:licencia de Creative Commons Reconocimiento 3.0 España
     

     

    Browse

    All of UCreaCommunities and CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Statistics

    View Usage Statistics
    About UCrea
    What is UcreaGuide of self-archivingThesis archiveOpen accessCopyright guideInstitutional policy
    Thinks in open
    Piensa en abierto
    Share

    UNIVERSIDAD DE CANTABRIA

    Repositorio realizado por la Biblioteca Universitaria utilizando DSpace software
    Contact Us | Send Feedback
    Metadatos sujetos a:licencia de Creative Commons Reconocimiento 3.0 España