Mass transfer around a cold cylinder with condensation of vapor (1st report)-mass flux decrease due to condensation of vapor at surface temperatures from 200 to 250K

Katsuyoshi Fukiba, Tetsuya Satou, Nobuyuki Tsubo, Hiroaki Kobayash

    Research output: Contribution to journalArticle

    Abstract

    A fundamental study of frost formation around a single cold cylinder was conducted using both experimental and numerical methods. We specifically examined the mass transfer around the cylinder under conditions in which a phase change of the vapor occurs in the flow. Through the experimental study, the mass flux to the cold surface of the cylinder was measured at a constant surface temperature (200-250 K). The results show that the mass flux decreases according to the decrease of the wall temperature below 230 K, although it increases above 230 K. This phenomenon cannot be expressed using the common equation with the Sherwood number, which excludes the vapor's phase change (condensation). Numerical studies calculated the flow over the cylinder, including the vapor's phase change. The scheme for compressible flow was modified to solve lower speed flow. Results of calculations show that we obtained the same tendency as that of the experiment: the mass flux decreases at low temperatures where the phase change occurs.

    Original languageEnglish
    Pages (from-to)151-159
    Number of pages9
    JournalTransactions of the Japan Society for Aeronautical and Space Sciences
    Volume50
    Issue number169
    DOIs
    Publication statusPublished - 2007

    Fingerprint

    Engine cylinders
    surface temperature
    mass transfer
    condensation
    Condensation
    Mass transfer
    Vapors
    vapors
    cold surfaces
    vapor phases
    compressible flow
    frost
    Temperature
    Compressible flow
    wall temperature
    numerical method
    low speed
    Numerical methods
    tendencies
    experimental study

    Keywords

    • Frost formation
    • Heat transfer
    • Mass transfer
    • Numerical simulation

    ASJC Scopus subject areas

    • Aerospace Engineering
    • Space and Planetary Science

    Cite this

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    title = "Mass transfer around a cold cylinder with condensation of vapor (1st report)-mass flux decrease due to condensation of vapor at surface temperatures from 200 to 250K",
    abstract = "A fundamental study of frost formation around a single cold cylinder was conducted using both experimental and numerical methods. We specifically examined the mass transfer around the cylinder under conditions in which a phase change of the vapor occurs in the flow. Through the experimental study, the mass flux to the cold surface of the cylinder was measured at a constant surface temperature (200-250 K). The results show that the mass flux decreases according to the decrease of the wall temperature below 230 K, although it increases above 230 K. This phenomenon cannot be expressed using the common equation with the Sherwood number, which excludes the vapor's phase change (condensation). Numerical studies calculated the flow over the cylinder, including the vapor's phase change. The scheme for compressible flow was modified to solve lower speed flow. Results of calculations show that we obtained the same tendency as that of the experiment: the mass flux decreases at low temperatures where the phase change occurs.",
    keywords = "Frost formation, Heat transfer, Mass transfer, Numerical simulation",
    author = "Katsuyoshi Fukiba and Tetsuya Satou and Nobuyuki Tsubo and Hiroaki Kobayash",
    year = "2007",
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    TY - JOUR

    T1 - Mass transfer around a cold cylinder with condensation of vapor (1st report)-mass flux decrease due to condensation of vapor at surface temperatures from 200 to 250K

    AU - Fukiba, Katsuyoshi

    AU - Satou, Tetsuya

    AU - Tsubo, Nobuyuki

    AU - Kobayash, Hiroaki

    PY - 2007

    Y1 - 2007

    N2 - A fundamental study of frost formation around a single cold cylinder was conducted using both experimental and numerical methods. We specifically examined the mass transfer around the cylinder under conditions in which a phase change of the vapor occurs in the flow. Through the experimental study, the mass flux to the cold surface of the cylinder was measured at a constant surface temperature (200-250 K). The results show that the mass flux decreases according to the decrease of the wall temperature below 230 K, although it increases above 230 K. This phenomenon cannot be expressed using the common equation with the Sherwood number, which excludes the vapor's phase change (condensation). Numerical studies calculated the flow over the cylinder, including the vapor's phase change. The scheme for compressible flow was modified to solve lower speed flow. Results of calculations show that we obtained the same tendency as that of the experiment: the mass flux decreases at low temperatures where the phase change occurs.

    AB - A fundamental study of frost formation around a single cold cylinder was conducted using both experimental and numerical methods. We specifically examined the mass transfer around the cylinder under conditions in which a phase change of the vapor occurs in the flow. Through the experimental study, the mass flux to the cold surface of the cylinder was measured at a constant surface temperature (200-250 K). The results show that the mass flux decreases according to the decrease of the wall temperature below 230 K, although it increases above 230 K. This phenomenon cannot be expressed using the common equation with the Sherwood number, which excludes the vapor's phase change (condensation). Numerical studies calculated the flow over the cylinder, including the vapor's phase change. The scheme for compressible flow was modified to solve lower speed flow. Results of calculations show that we obtained the same tendency as that of the experiment: the mass flux decreases at low temperatures where the phase change occurs.

    KW - Frost formation

    KW - Heat transfer

    KW - Mass transfer

    KW - Numerical simulation

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