Two-phase minor loss due to the 45-degree elbow in horizontal bubbly flow

Seungjin Kim, Gunol Kojasoy, Tangwen Guo

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

    2 Citations (Scopus)

    Abstract

    The present study investigates the geometric effects of a 45-degree elbow on the pressure drop due to the minor loss in horizontal bubbly flow. A round glass tube with inner diameter of 50.3 mm is employed as a test section, along which a 45-degree elbow is installed at L/D=353.5 from the two-phase mixture inlet. In total, 15 different flow conditions are examined. The local static pressures are measured at four axial locations at L/D=197, 342, 363 and 419 from the two-phase mixture inlet. The effect of the elbow is clearly demonstrated in the pressure data along the axial direction. In the data analysis, the pressure data previously acquired with a 90-degree elbow is also utilized as well. The conventional Lockhart-Martinelli correlation with parameter C=30 predicts the overall two-phase frictional pressure loss well for both the 90-degree and 45-degree elbow experiments. A new correlation analogous to Lockhart and Martinelli's is developed for the two-phase frictional pressure loss across the elbows. The new correlation with the parameter C=65 and the minor loss factors of k=0.58 and k=0.35 for the 90-degree and 45-degree elbows, respectively, yields the best fit to the data. The average percent differences between the predictions made by the new correlation and the data are ±2.1% and ±1.3% for 90-degree and 45-degree cases, respectively.

    Original languageEnglish (US)
    Title of host publicationProceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12
    StatePublished - Dec 1 2007
    Event12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12 - Pittsburgh, PA, United States
    Duration: Sep 30 2007Oct 4 2007

    Publication series

    NameProceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12

    Other

    Other12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12
    CountryUnited States
    CityPittsburgh, PA
    Period9/30/0710/4/07

    Fingerprint

    static pressure
    pressure drop
    Pressure drop
    tubes
    glass
    predictions
    Glass
    Experiments

    All Science Journal Classification (ASJC) codes

    • Nuclear Energy and Engineering
    • Nuclear and High Energy Physics

    Cite this

    Kim, S., Kojasoy, G., & Guo, T. (2007). Two-phase minor loss due to the 45-degree elbow in horizontal bubbly flow. In Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12 (Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12).
    Kim, Seungjin ; Kojasoy, Gunol ; Guo, Tangwen. / Two-phase minor loss due to the 45-degree elbow in horizontal bubbly flow. Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12. 2007. (Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12).
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    title = "Two-phase minor loss due to the 45-degree elbow in horizontal bubbly flow",
    abstract = "The present study investigates the geometric effects of a 45-degree elbow on the pressure drop due to the minor loss in horizontal bubbly flow. A round glass tube with inner diameter of 50.3 mm is employed as a test section, along which a 45-degree elbow is installed at L/D=353.5 from the two-phase mixture inlet. In total, 15 different flow conditions are examined. The local static pressures are measured at four axial locations at L/D=197, 342, 363 and 419 from the two-phase mixture inlet. The effect of the elbow is clearly demonstrated in the pressure data along the axial direction. In the data analysis, the pressure data previously acquired with a 90-degree elbow is also utilized as well. The conventional Lockhart-Martinelli correlation with parameter C=30 predicts the overall two-phase frictional pressure loss well for both the 90-degree and 45-degree elbow experiments. A new correlation analogous to Lockhart and Martinelli's is developed for the two-phase frictional pressure loss across the elbows. The new correlation with the parameter C=65 and the minor loss factors of k=0.58 and k=0.35 for the 90-degree and 45-degree elbows, respectively, yields the best fit to the data. The average percent differences between the predictions made by the new correlation and the data are ±2.1{\%} and ±1.3{\%} for 90-degree and 45-degree cases, respectively.",
    author = "Seungjin Kim and Gunol Kojasoy and Tangwen Guo",
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    Kim, S, Kojasoy, G & Guo, T 2007, Two-phase minor loss due to the 45-degree elbow in horizontal bubbly flow. in Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12. Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12, 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12, Pittsburgh, PA, United States, 9/30/07.

    Two-phase minor loss due to the 45-degree elbow in horizontal bubbly flow. / Kim, Seungjin; Kojasoy, Gunol; Guo, Tangwen.

    Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12. 2007. (Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12).

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

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    T1 - Two-phase minor loss due to the 45-degree elbow in horizontal bubbly flow

    AU - Kim, Seungjin

    AU - Kojasoy, Gunol

    AU - Guo, Tangwen

    PY - 2007/12/1

    Y1 - 2007/12/1

    N2 - The present study investigates the geometric effects of a 45-degree elbow on the pressure drop due to the minor loss in horizontal bubbly flow. A round glass tube with inner diameter of 50.3 mm is employed as a test section, along which a 45-degree elbow is installed at L/D=353.5 from the two-phase mixture inlet. In total, 15 different flow conditions are examined. The local static pressures are measured at four axial locations at L/D=197, 342, 363 and 419 from the two-phase mixture inlet. The effect of the elbow is clearly demonstrated in the pressure data along the axial direction. In the data analysis, the pressure data previously acquired with a 90-degree elbow is also utilized as well. The conventional Lockhart-Martinelli correlation with parameter C=30 predicts the overall two-phase frictional pressure loss well for both the 90-degree and 45-degree elbow experiments. A new correlation analogous to Lockhart and Martinelli's is developed for the two-phase frictional pressure loss across the elbows. The new correlation with the parameter C=65 and the minor loss factors of k=0.58 and k=0.35 for the 90-degree and 45-degree elbows, respectively, yields the best fit to the data. The average percent differences between the predictions made by the new correlation and the data are ±2.1% and ±1.3% for 90-degree and 45-degree cases, respectively.

    AB - The present study investigates the geometric effects of a 45-degree elbow on the pressure drop due to the minor loss in horizontal bubbly flow. A round glass tube with inner diameter of 50.3 mm is employed as a test section, along which a 45-degree elbow is installed at L/D=353.5 from the two-phase mixture inlet. In total, 15 different flow conditions are examined. The local static pressures are measured at four axial locations at L/D=197, 342, 363 and 419 from the two-phase mixture inlet. The effect of the elbow is clearly demonstrated in the pressure data along the axial direction. In the data analysis, the pressure data previously acquired with a 90-degree elbow is also utilized as well. The conventional Lockhart-Martinelli correlation with parameter C=30 predicts the overall two-phase frictional pressure loss well for both the 90-degree and 45-degree elbow experiments. A new correlation analogous to Lockhart and Martinelli's is developed for the two-phase frictional pressure loss across the elbows. The new correlation with the parameter C=65 and the minor loss factors of k=0.58 and k=0.35 for the 90-degree and 45-degree elbows, respectively, yields the best fit to the data. The average percent differences between the predictions made by the new correlation and the data are ±2.1% and ±1.3% for 90-degree and 45-degree cases, respectively.

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    M3 - Conference contribution

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    BT - Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12

    ER -

    Kim S, Kojasoy G, Guo T. Two-phase minor loss due to the 45-degree elbow in horizontal bubbly flow. In Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12. 2007. (Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12).