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    Visualization and Validation of Ejector Flow Field With Computational and First Principles Analysis

    Source: Journal of Fluids Engineering:;2015:;volume( 137 ):;issue: 005::page 51107
    Author:
    Little, Adrienne B.
    ,
    Bartosiewicz, Yann
    ,
    Garimella, Srinivas
    DOI: 10.1115/1.4029534
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Passive, heat actuated ejector pumps offer simple and energyefficient options for a variety of end uses with no electrical input or moving parts. In an effort to obtain insights into ejector flow phenomena and to evaluate the effectiveness of commonly used computational and analytical tools in predicting these conditions, this study presents a set of shadowgraph images of flow inside a largescale air ejector and compares them to both computational and firstprinciplesbased analytical models of the same flow. The computational simulations used for comparison apply kخµ renormalization group (RNG) and kد‰ shear stress transport (SST) turbulence models to twodimensional (2D), locally refined rectangular meshes for ideal gas air flow. A complementary analytical model is constructed from first principles to approximate the ejector flow field. Results show that ondesign ejector operation is predicted with reasonable accuracy, but accuracy with the same models is not adequate at offdesign conditions. Exploration of local flow features shows that the kد‰ SST model predicts the location of flow features, as well as global inlet mass flow rates, with greater accuracy. The firstprinciples model demonstrates a method for resolving the ejector flow field from relatively little visual data and shows the evolving importance of mixing, momentum, and heat exchange with the suction flow with distance from the motive nozzle exit. Such detailed global and local exploration of ejector flow helps guide the selection of appropriate turbulence models for future ejector design purposes, predicts locations of important flow phenomena, and allows for more efficient ejector design and operation.
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      Visualization and Validation of Ejector Flow Field With Computational and First Principles Analysis

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    http://yetl.yabesh.ir/yetl1/handle/yetl/158246
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    contributor authorLittle, Adrienne B.
    contributor authorBartosiewicz, Yann
    contributor authorGarimella, Srinivas
    date accessioned2017-05-09T01:18:56Z
    date available2017-05-09T01:18:56Z
    date issued2015
    identifier issn0098-2202
    identifier otherfe_137_05_051107.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/158246
    description abstractPassive, heat actuated ejector pumps offer simple and energyefficient options for a variety of end uses with no electrical input or moving parts. In an effort to obtain insights into ejector flow phenomena and to evaluate the effectiveness of commonly used computational and analytical tools in predicting these conditions, this study presents a set of shadowgraph images of flow inside a largescale air ejector and compares them to both computational and firstprinciplesbased analytical models of the same flow. The computational simulations used for comparison apply kخµ renormalization group (RNG) and kد‰ shear stress transport (SST) turbulence models to twodimensional (2D), locally refined rectangular meshes for ideal gas air flow. A complementary analytical model is constructed from first principles to approximate the ejector flow field. Results show that ondesign ejector operation is predicted with reasonable accuracy, but accuracy with the same models is not adequate at offdesign conditions. Exploration of local flow features shows that the kد‰ SST model predicts the location of flow features, as well as global inlet mass flow rates, with greater accuracy. The firstprinciples model demonstrates a method for resolving the ejector flow field from relatively little visual data and shows the evolving importance of mixing, momentum, and heat exchange with the suction flow with distance from the motive nozzle exit. Such detailed global and local exploration of ejector flow helps guide the selection of appropriate turbulence models for future ejector design purposes, predicts locations of important flow phenomena, and allows for more efficient ejector design and operation.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleVisualization and Validation of Ejector Flow Field With Computational and First Principles Analysis
    typeJournal Paper
    journal volume137
    journal issue5
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4029534
    journal fristpage51107
    journal lastpage51107
    identifier eissn1528-901X
    treeJournal of Fluids Engineering:;2015:;volume( 137 ):;issue: 005
    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