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    Flow-Induced Instability of Heat-Exchanger Tubes due to Axial Flow in a Diffuser-Shaped, Loose Intermediate Support

    Source: Journal of Pressure Vessel Technology:;1989:;volume( 111 ):;issue: 004::page 428
    Author:
    A. Yasuo
    ,
    M. P. Paidoussis
    DOI: 10.1115/1.3265700
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In some heat exchangers and steam generators, the flow is predominantly axial, and the external fluid flows between baffled compartments through enlarged holes in the baffles around the heat exchanger tubes. Thus, the tube is subjected to relatively high flow velocities over small portions of its length, in the baffle locations. In this paper, the dynamics of such an idealized system is investigated, involving a cylindrical beam with pinned ends in axial flow, going through a baffle plate of finite thickness at some intermediate point, with small radial clearance. The fluid forces along the tube are formulated in a manner reminiscent of the transfer-matrix technique, since the character of these forces changes drastically along the tube. The fluid forces are determined approximately by means of potential flow theory, and viscous effects are taken into account only in a global sense. It was found that if the flow passage through the baffle plate is diffuser-shaped, negative fluid-dynamic damping is generated therein, destabilizing the system and leading to flutter at relatively low flow velocities. The instability depends critically on the shape of the hole through the baffle and on the clearance; thus a convergent-type flow passage does not lead to instability. The negative fluid-dynamic damping is linearly proportional to the flow velocity through the baffle.
    keyword(s): Flow (Dynamics) , Diffusers , Heat exchangers , Axial flow , Fluids , Force , Clearances (Engineering) , Damping , Dynamics (Mechanics) , Shapes , Thickness , Flutter (Aerodynamics) , Boilers AND Fluid dynamics ,
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      Flow-Induced Instability of Heat-Exchanger Tubes due to Axial Flow in a Diffuser-Shaped, Loose Intermediate Support

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    http://yetl.yabesh.ir/yetl1/handle/yetl/105848
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    • Journal of Pressure Vessel Technology

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    contributor authorA. Yasuo
    contributor authorM. P. Paidoussis
    date accessioned2017-05-08T23:30:47Z
    date available2017-05-08T23:30:47Z
    date copyrightNovember, 1989
    date issued1989
    identifier issn0094-9930
    identifier otherJPVTAS-28315#428_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/105848
    description abstractIn some heat exchangers and steam generators, the flow is predominantly axial, and the external fluid flows between baffled compartments through enlarged holes in the baffles around the heat exchanger tubes. Thus, the tube is subjected to relatively high flow velocities over small portions of its length, in the baffle locations. In this paper, the dynamics of such an idealized system is investigated, involving a cylindrical beam with pinned ends in axial flow, going through a baffle plate of finite thickness at some intermediate point, with small radial clearance. The fluid forces along the tube are formulated in a manner reminiscent of the transfer-matrix technique, since the character of these forces changes drastically along the tube. The fluid forces are determined approximately by means of potential flow theory, and viscous effects are taken into account only in a global sense. It was found that if the flow passage through the baffle plate is diffuser-shaped, negative fluid-dynamic damping is generated therein, destabilizing the system and leading to flutter at relatively low flow velocities. The instability depends critically on the shape of the hole through the baffle and on the clearance; thus a convergent-type flow passage does not lead to instability. The negative fluid-dynamic damping is linearly proportional to the flow velocity through the baffle.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleFlow-Induced Instability of Heat-Exchanger Tubes due to Axial Flow in a Diffuser-Shaped, Loose Intermediate Support
    typeJournal Paper
    journal volume111
    journal issue4
    journal titleJournal of Pressure Vessel Technology
    identifier doi10.1115/1.3265700
    journal fristpage428
    journal lastpage434
    identifier eissn1528-8978
    keywordsFlow (Dynamics)
    keywordsDiffusers
    keywordsHeat exchangers
    keywordsAxial flow
    keywordsFluids
    keywordsForce
    keywordsClearances (Engineering)
    keywordsDamping
    keywordsDynamics (Mechanics)
    keywordsShapes
    keywordsThickness
    keywordsFlutter (Aerodynamics)
    keywordsBoilers AND Fluid dynamics
    treeJournal of Pressure Vessel Technology:;1989:;volume( 111 ):;issue: 004
    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
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