A measurement of mixing-cup temperature

Tetsu Fujii, Shigeru Koyama, Yōichi Shimizu

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    The accuracy of measurement of mixing-cup temperature is discussed for a cylindrical mixing chamber in which specially designed baffle plates are inserted. The temperatures measured by the chambers at the inlet and outlet of an electrically heated vertical tube are compared with those predicted by heat balance. The flow pattern in the mixing chamber is observed by the hydrogen bubble method. Pressure loss is also measured. For the accurate measurement, two baffle plates are sufficient in the laminar flow region when the distance between them is relatively large, while no baffle plate is necessary in the turbulent flow region. In the laminar-turbulent transition region (Re=2 000~3 000), temperature fluctuations at the heated tube wall as well as at the outlet of the mixing chamber are outstanding in comparison with those in laminar and turbulent regions. It is clarified, by simple analysis using a lumped-heat-capacity model, that the temperature fluctuations at the transition region are due to a combined effect of both laminar-turbulent flow intermittency and heat capacity of the heated tube.

    Original languageEnglish
    Pages (from-to)560-565
    Number of pages6
    JournalTransactions of the Japan Society of Mechanical Engineers Series B
    Volume53
    Issue number486
    DOIs
    Publication statusPublished - Jan 1 1987

    Fingerprint

    baffles
    chambers
    outlets
    tubes
    turbulent flow
    Turbulent flow
    Specific heat
    specific heat
    heat balance
    Temperature
    temperature
    intermittency
    laminar flow
    Laminar flow
    Flow patterns
    flow distribution
    bubbles
    Hydrogen
    hydrogen

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanical Engineering

    Cite this

    A measurement of mixing-cup temperature. / Fujii, Tetsu; Koyama, Shigeru; Shimizu, Yōichi.

    In: Transactions of the Japan Society of Mechanical Engineers Series B, Vol. 53, No. 486, 01.01.1987, p. 560-565.

    Research output: Contribution to journalArticle

    Fujii, Tetsu ; Koyama, Shigeru ; Shimizu, Yōichi. / A measurement of mixing-cup temperature. In: Transactions of the Japan Society of Mechanical Engineers Series B. 1987 ; Vol. 53, No. 486. pp. 560-565.
    @article{834f2f5a3bb94f45aaa473c028de4a92,
    title = "A measurement of mixing-cup temperature",
    abstract = "The accuracy of measurement of mixing-cup temperature is discussed for a cylindrical mixing chamber in which specially designed baffle plates are inserted. The temperatures measured by the chambers at the inlet and outlet of an electrically heated vertical tube are compared with those predicted by heat balance. The flow pattern in the mixing chamber is observed by the hydrogen bubble method. Pressure loss is also measured. For the accurate measurement, two baffle plates are sufficient in the laminar flow region when the distance between them is relatively large, while no baffle plate is necessary in the turbulent flow region. In the laminar-turbulent transition region (Re=2 000~3 000), temperature fluctuations at the heated tube wall as well as at the outlet of the mixing chamber are outstanding in comparison with those in laminar and turbulent regions. It is clarified, by simple analysis using a lumped-heat-capacity model, that the temperature fluctuations at the transition region are due to a combined effect of both laminar-turbulent flow intermittency and heat capacity of the heated tube.",
    author = "Tetsu Fujii and Shigeru Koyama and Yōichi Shimizu",
    year = "1987",
    month = "1",
    day = "1",
    doi = "10.1299/kikaib.53.560",
    language = "English",
    volume = "53",
    pages = "560--565",
    journal = "Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B",
    issn = "0387-5016",
    publisher = "The Japan Society of Mechanical Engineers",
    number = "486",

    }

    TY - JOUR

    T1 - A measurement of mixing-cup temperature

    AU - Fujii, Tetsu

    AU - Koyama, Shigeru

    AU - Shimizu, Yōichi

    PY - 1987/1/1

    Y1 - 1987/1/1

    N2 - The accuracy of measurement of mixing-cup temperature is discussed for a cylindrical mixing chamber in which specially designed baffle plates are inserted. The temperatures measured by the chambers at the inlet and outlet of an electrically heated vertical tube are compared with those predicted by heat balance. The flow pattern in the mixing chamber is observed by the hydrogen bubble method. Pressure loss is also measured. For the accurate measurement, two baffle plates are sufficient in the laminar flow region when the distance between them is relatively large, while no baffle plate is necessary in the turbulent flow region. In the laminar-turbulent transition region (Re=2 000~3 000), temperature fluctuations at the heated tube wall as well as at the outlet of the mixing chamber are outstanding in comparison with those in laminar and turbulent regions. It is clarified, by simple analysis using a lumped-heat-capacity model, that the temperature fluctuations at the transition region are due to a combined effect of both laminar-turbulent flow intermittency and heat capacity of the heated tube.

    AB - The accuracy of measurement of mixing-cup temperature is discussed for a cylindrical mixing chamber in which specially designed baffle plates are inserted. The temperatures measured by the chambers at the inlet and outlet of an electrically heated vertical tube are compared with those predicted by heat balance. The flow pattern in the mixing chamber is observed by the hydrogen bubble method. Pressure loss is also measured. For the accurate measurement, two baffle plates are sufficient in the laminar flow region when the distance between them is relatively large, while no baffle plate is necessary in the turbulent flow region. In the laminar-turbulent transition region (Re=2 000~3 000), temperature fluctuations at the heated tube wall as well as at the outlet of the mixing chamber are outstanding in comparison with those in laminar and turbulent regions. It is clarified, by simple analysis using a lumped-heat-capacity model, that the temperature fluctuations at the transition region are due to a combined effect of both laminar-turbulent flow intermittency and heat capacity of the heated tube.

    UR - http://www.scopus.com/inward/record.url?scp=0023295976&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0023295976&partnerID=8YFLogxK

    U2 - 10.1299/kikaib.53.560

    DO - 10.1299/kikaib.53.560

    M3 - Article

    AN - SCOPUS:0023295976

    VL - 53

    SP - 560

    EP - 565

    JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

    JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

    SN - 0387-5016

    IS - 486

    ER -