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    An Improved Model for Predicting Affected Region of Flashing Jet

    Source: Journal of Pressure Vessel Technology:;2024:;volume( 146 ):;issue: 006::page 61401-1
    Author:
    Yuasa, Tomohisa
    ,
    Watanabe, Shun
    ,
    Morita, Ryo
    DOI: 10.1115/1.4066558
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: When a water piping system operating under high temperatures and pressures is damaged and water is expelled into the atmosphere, a phenomenon known as depressurization boiling or flashing occurs. This flashing jet poses a risk to human safety and can damage safety equipment through impingement. Consequently, evaluating the region affected by the flashing jet impinging on the surrounding equipment and people is necessary. In this study, we conducted experiments to verify the affected region of the jet involving both saturated and subcooled water under low-pressure conditions at the jet inlet, up to 2 MPaA, and extended our investigation to high-pressure conditions up to 7 MPaA using computational fluid dynamics (CFD). The findings revealed that the mass flux predictions, according to the homogeneous equilibrium model (HEM) outlined in the American National Standards Institute (ANSI) standard, align with both experimental and CFD analysis results. However, the evaluations of both the asymptotic plane width and distance—parameters delineating the jet's affected region—were found to be underestimated in the ANSI standard compared with the experimental and CFD analysis results. To address this difference from real phenomena, we developed an improved model that incorporates mass flux and enthalpy as variables. This improved model more accurately predict the asymptotic plane width and distance than the ANSI standard. Utilizing this improved model enables precise prediction of the flashing jet's affected region, spanning conditions from saturated to subcooled water across various pipe diameters.
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      An Improved Model for Predicting Affected Region of Flashing Jet

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4305987
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    contributor authorYuasa, Tomohisa
    contributor authorWatanabe, Shun
    contributor authorMorita, Ryo
    date accessioned2025-04-21T10:20:48Z
    date available2025-04-21T10:20:48Z
    date copyright10/22/2024 12:00:00 AM
    date issued2024
    identifier issn0094-9930
    identifier otherpvt_146_06_061401.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4305987
    description abstractWhen a water piping system operating under high temperatures and pressures is damaged and water is expelled into the atmosphere, a phenomenon known as depressurization boiling or flashing occurs. This flashing jet poses a risk to human safety and can damage safety equipment through impingement. Consequently, evaluating the region affected by the flashing jet impinging on the surrounding equipment and people is necessary. In this study, we conducted experiments to verify the affected region of the jet involving both saturated and subcooled water under low-pressure conditions at the jet inlet, up to 2 MPaA, and extended our investigation to high-pressure conditions up to 7 MPaA using computational fluid dynamics (CFD). The findings revealed that the mass flux predictions, according to the homogeneous equilibrium model (HEM) outlined in the American National Standards Institute (ANSI) standard, align with both experimental and CFD analysis results. However, the evaluations of both the asymptotic plane width and distance—parameters delineating the jet's affected region—were found to be underestimated in the ANSI standard compared with the experimental and CFD analysis results. To address this difference from real phenomena, we developed an improved model that incorporates mass flux and enthalpy as variables. This improved model more accurately predict the asymptotic plane width and distance than the ANSI standard. Utilizing this improved model enables precise prediction of the flashing jet's affected region, spanning conditions from saturated to subcooled water across various pipe diameters.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleAn Improved Model for Predicting Affected Region of Flashing Jet
    typeJournal Paper
    journal volume146
    journal issue6
    journal titleJournal of Pressure Vessel Technology
    identifier doi10.1115/1.4066558
    journal fristpage61401-1
    journal lastpage61401-9
    page9
    treeJournal of Pressure Vessel Technology:;2024:;volume( 146 ):;issue: 006
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian