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    Flow in Helical Annular Pipe

    Source: Journal of Engineering Mechanics:;2000:;Volume ( 126 ):;issue: 010
    Author:
    JinSuo Zhang
    ,
    BenZhao Zhang
    ,
    HuaJun Chen
    DOI: 10.1061/(ASCE)0733-9399(2000)126:10(1040)
    Publisher: American Society of Civil Engineers
    Abstract: In this paper, the axial and the secondary flow in a helical annular pipe are examined by a perturbation method in a curvilinear coordinate system, and the second-order perturbation solution is obtained completely. The secondary flow, the axial velocity, and the flux ratio are studied in detail. When the torsion is zero, the secondary flow behaves as four vortexes, and they are symmetrical up and down. When it is not zero, the symmetry is destroyed, and the intensity and number of the secondary flow vortexes are affected by the Dean number and the radius ratio of the inner/outer circle wall of the annular cross section. The maximum of the axial velocity appears near the inner bend when the Dean number is small, and it is moved toward the outer bend as the Dean number increases.
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      Flow in Helical Annular Pipe

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    http://yetl.yabesh.ir/yetl1/handle/yetl/85096
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    contributor authorJinSuo Zhang
    contributor authorBenZhao Zhang
    contributor authorHuaJun Chen
    date accessioned2017-05-08T22:39:05Z
    date available2017-05-08T22:39:05Z
    date copyrightOctober 2000
    date issued2000
    identifier other%28asce%290733-9399%282000%29126%3A10%281040%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/85096
    description abstractIn this paper, the axial and the secondary flow in a helical annular pipe are examined by a perturbation method in a curvilinear coordinate system, and the second-order perturbation solution is obtained completely. The secondary flow, the axial velocity, and the flux ratio are studied in detail. When the torsion is zero, the secondary flow behaves as four vortexes, and they are symmetrical up and down. When it is not zero, the symmetry is destroyed, and the intensity and number of the secondary flow vortexes are affected by the Dean number and the radius ratio of the inner/outer circle wall of the annular cross section. The maximum of the axial velocity appears near the inner bend when the Dean number is small, and it is moved toward the outer bend as the Dean number increases.
    publisherAmerican Society of Civil Engineers
    titleFlow in Helical Annular Pipe
    typeJournal Paper
    journal volume126
    journal issue10
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)0733-9399(2000)126:10(1040)
    treeJournal of Engineering Mechanics:;2000:;Volume ( 126 ):;issue: 010
    contenttypeFulltext
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