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    Relationship Between Wavy Liquid Film Dynamics and Droplet Formation From Trailing Edge

    Source: Journal of Engineering for Gas Turbines and Power:;2024:;volume( 147 ):;issue: 003::page 31014-1
    Author:
    Kamada, Yoshiaki
    ,
    Murakami, Keito
    ,
    Wang, Zhenying
    ,
    Inoue, Chihiro
    ,
    Senoo, Shigeki
    DOI: 10.1115/1.4066375
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Erosion of steam turbine blades due to coarse droplet impingement is a serious problem. The physical relationship is still elusive between the dynamics of wavy liquid film on a wall and the droplet dispersion from the trailing edge. In this study, we experimentally and theoretically investigate the liquid film subjected to the turbulent airflow and following fragmentation process under well-controlled flow conditions, where the airflow velocity is up to 100 m/s, and initial liquid film velocity is 0.06 and 0.10 m/s, and trailing edge thicknesses are 0.5, 1.0, and 2.0 mm. By applying the developed planar laser-induced fluorescence (PLIF)-based method with no use of artificial threshold of brightness, we quantify the film thickness and interfacial friction factor. As the airflow velocity increases, the liquid film instability promotes and the interfacial friction factor increases, much exceeding the Blasius correlation. When the liquid film reaches the trailing edge, several liquid columns extend by the Rayleigh–Taylor instability. We identify that the interfacial friction factor to accelerate the ligament corresponds to the Blasius correlation, distinct from the one on the wavy liquid film upstream. Incorporating the identified two interfacial friction factors, we successfully formulate the diameter of ligament as the characteristic lengthscale of the spreading droplet downstream. Derived formulation for the droplet statistics is well validated by the experimental results of mean and maximum diameters and size distribution.
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      Relationship Between Wavy Liquid Film Dynamics and Droplet Formation From Trailing Edge

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    contributor authorKamada, Yoshiaki
    contributor authorMurakami, Keito
    contributor authorWang, Zhenying
    contributor authorInoue, Chihiro
    contributor authorSenoo, Shigeki
    date accessioned2025-04-21T10:13:07Z
    date available2025-04-21T10:13:07Z
    date copyright10/4/2024 12:00:00 AM
    date issued2024
    identifier issn0742-4795
    identifier othergtp_147_03_031014.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4305732
    description abstractErosion of steam turbine blades due to coarse droplet impingement is a serious problem. The physical relationship is still elusive between the dynamics of wavy liquid film on a wall and the droplet dispersion from the trailing edge. In this study, we experimentally and theoretically investigate the liquid film subjected to the turbulent airflow and following fragmentation process under well-controlled flow conditions, where the airflow velocity is up to 100 m/s, and initial liquid film velocity is 0.06 and 0.10 m/s, and trailing edge thicknesses are 0.5, 1.0, and 2.0 mm. By applying the developed planar laser-induced fluorescence (PLIF)-based method with no use of artificial threshold of brightness, we quantify the film thickness and interfacial friction factor. As the airflow velocity increases, the liquid film instability promotes and the interfacial friction factor increases, much exceeding the Blasius correlation. When the liquid film reaches the trailing edge, several liquid columns extend by the Rayleigh–Taylor instability. We identify that the interfacial friction factor to accelerate the ligament corresponds to the Blasius correlation, distinct from the one on the wavy liquid film upstream. Incorporating the identified two interfacial friction factors, we successfully formulate the diameter of ligament as the characteristic lengthscale of the spreading droplet downstream. Derived formulation for the droplet statistics is well validated by the experimental results of mean and maximum diameters and size distribution.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleRelationship Between Wavy Liquid Film Dynamics and Droplet Formation From Trailing Edge
    typeJournal Paper
    journal volume147
    journal issue3
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4066375
    journal fristpage31014-1
    journal lastpage31014-8
    page8
    treeJournal of Engineering for Gas Turbines and Power:;2024:;volume( 147 ):;issue: 003
    contenttypeFulltext
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