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    Dynamic Characterization of Vortex Structures and Their Evolution Mechanisms in a Side Channel Pump

    Source: Journal of Fluids Engineering:;2020:;volume( 142 ):;issue: 011::page 0111502-1
    Author:
    Zhang, Fan
    ,
    Appiah, Desmond
    ,
    Chen, Ke
    ,
    Yuan, Shouqi
    ,
    Adu-Poku, Kofi Asamoah
    ,
    Wang, Yefang
    DOI: 10.1115/1.4047808
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: To obtain a better insight into the unsteady flow behavior in side channel pumps by a robust vortex identification method, this study presents the efficacy of the new Ω-criterion in characterizing the evolution of vortex structures in the turbulent flows under different time steps. The flow behavior and the underlying vorticity dynamics were revealed as well. Compared to Q-criterion, the new Ω-criterion identified all vortex structures irrespective of the intensity at a universal threshold of 0.52. Three different types of vortex structures (longitudinal, axial, and radial) were identified to be responsible for the turbulent flows in the side channel pumps. The beneficial longitudinal vortex promotes the momentum exchange flow between the impeller and side channel which leads to the high hydraulic head of side channel pumps. On the other hand, the unfavorable axial and radial vortex structures restricted in the impeller passage mitigate the exchange process accounting for the low efficiency of the pumps. From this study, it can be established that the evolution of the axial vortex structures is responsible for the largest vortex distribution in the impeller compared to the total vortex evolved. The impeller outer radius contributes about 60% of the unfavorable axial structures evolved. Using the new Ω-criterion, many reported anomalous findings have been explained.
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      Dynamic Characterization of Vortex Structures and Their Evolution Mechanisms in a Side Channel Pump

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4274625
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    contributor authorZhang, Fan
    contributor authorAppiah, Desmond
    contributor authorChen, Ke
    contributor authorYuan, Shouqi
    contributor authorAdu-Poku, Kofi Asamoah
    contributor authorWang, Yefang
    date accessioned2022-02-04T21:58:17Z
    date available2022-02-04T21:58:17Z
    date copyright8/7/2020 12:00:00 AM
    date issued2020
    identifier issn0098-2202
    identifier otherfe_142_10_101215.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4274625
    description abstractTo obtain a better insight into the unsteady flow behavior in side channel pumps by a robust vortex identification method, this study presents the efficacy of the new Ω-criterion in characterizing the evolution of vortex structures in the turbulent flows under different time steps. The flow behavior and the underlying vorticity dynamics were revealed as well. Compared to Q-criterion, the new Ω-criterion identified all vortex structures irrespective of the intensity at a universal threshold of 0.52. Three different types of vortex structures (longitudinal, axial, and radial) were identified to be responsible for the turbulent flows in the side channel pumps. The beneficial longitudinal vortex promotes the momentum exchange flow between the impeller and side channel which leads to the high hydraulic head of side channel pumps. On the other hand, the unfavorable axial and radial vortex structures restricted in the impeller passage mitigate the exchange process accounting for the low efficiency of the pumps. From this study, it can be established that the evolution of the axial vortex structures is responsible for the largest vortex distribution in the impeller compared to the total vortex evolved. The impeller outer radius contributes about 60% of the unfavorable axial structures evolved. Using the new Ω-criterion, many reported anomalous findings have been explained.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleDynamic Characterization of Vortex Structures and Their Evolution Mechanisms in a Side Channel Pump
    typeJournal Paper
    journal volume142
    journal issue11
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4047808
    journal fristpage0111502-1
    journal lastpage0111502-10
    page10
    treeJournal of Fluids Engineering:;2020:;volume( 142 ):;issue: 011
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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