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    Multiphase Flow in a Liquid-Ring Vacuum Pump

    Source: Journal of Fluids Engineering:;2020:;volume( 143 ):;issue: 001::page 011404-1
    Author:
    Pandey, Ashutosh
    ,
    Khan, Sajid
    ,
    Dekker, Rick
    ,
    Shih, Tom I-P.
    DOI: 10.1115/1.4047848
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A computational study based on unsteady Reynolds-averaged Navier–Stokes that resolves the gas–liquid interface was performed to examine the unsteady multiphase flow in a liquid-ring pump as a function of its inlet pressure (10, 40, and 80 kPa) and its impeller's rotational speed (1150, 1450, and 1750 rpm). Results obtained show the shape of the liquid ring to play a critical role in creating the expansion ratio needed to draw air into the pump and the compression ratio needed to expel air out of the pump. The dominant processes that determine the shape of the liquid ring was found to be the centrifugal force from rotation, the acceleration and deceleration due to the difference in pressure at the pump's inlet and outlet, and the eccentricity of the impeller relative to the pump's housing. Results are presented to show how the rotational speed of the impeller and the pressure at the pump's inlet affect the nature of the multiphase flow in the pump as well as the pump's effectiveness in creating a vacuum. The effects of heat transfer on the gas phase during the compression and expansion processes were found to be approximated well by polytropic processes. This computational study was validated by comparing computed with measured volumetric flowrates ingested through the suction port and the torque exerted on the pump's impeller.
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      Multiphase Flow in a Liquid-Ring Vacuum Pump

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    contributor authorPandey, Ashutosh
    contributor authorKhan, Sajid
    contributor authorDekker, Rick
    contributor authorShih, Tom I-P.
    date accessioned2022-02-05T22:14:08Z
    date available2022-02-05T22:14:08Z
    date copyright10/26/2020 12:00:00 AM
    date issued2020
    identifier issn0098-2202
    identifier otherfe_143_01_011404.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4277179
    description abstractA computational study based on unsteady Reynolds-averaged Navier–Stokes that resolves the gas–liquid interface was performed to examine the unsteady multiphase flow in a liquid-ring pump as a function of its inlet pressure (10, 40, and 80 kPa) and its impeller's rotational speed (1150, 1450, and 1750 rpm). Results obtained show the shape of the liquid ring to play a critical role in creating the expansion ratio needed to draw air into the pump and the compression ratio needed to expel air out of the pump. The dominant processes that determine the shape of the liquid ring was found to be the centrifugal force from rotation, the acceleration and deceleration due to the difference in pressure at the pump's inlet and outlet, and the eccentricity of the impeller relative to the pump's housing. Results are presented to show how the rotational speed of the impeller and the pressure at the pump's inlet affect the nature of the multiphase flow in the pump as well as the pump's effectiveness in creating a vacuum. The effects of heat transfer on the gas phase during the compression and expansion processes were found to be approximated well by polytropic processes. This computational study was validated by comparing computed with measured volumetric flowrates ingested through the suction port and the torque exerted on the pump's impeller.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleMultiphase Flow in a Liquid-Ring Vacuum Pump
    typeJournal Paper
    journal volume143
    journal issue1
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4047848
    journal fristpage011404-1
    journal lastpage011404-13
    page13
    treeJournal of Fluids Engineering:;2020:;volume( 143 ):;issue: 001
    contenttypeFulltext
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