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    A Theory for Turbulent Fluid Films and Its Application to Bearings

    Source: Journal of Tribology:;1967:;volume( 089 ):;issue: 003::page 346
    Author:
    H. G. Elrod
    ,
    C. W. Ng
    DOI: 10.1115/1.3616989
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In this paper a new turbulent lubrication analysis has been derived which takes into account certain well-established facts concerning turbulent shear flow. Consistent with lubrication-film theory, the nature of the local flow is taken to depend only on local film thickness, surface velocity, and pressure gradients. An eddy diffusivity treatment is used which incorporates the “law of wall” with the use of local (within the film) shear stress. Stress reversal phenomena are accommodated and isotropy of the turbulent exchange mechanism in the plane of the film is assured. Coefficients are developed for use in the generalized Reynolds (lubrication) equation, and computation procedures for the static and dynamic characteristics of turbulent, self-acting bearings have been prepared. The nonlinear effects due to the coupling of the shear induced flows and the flows due to the circumferential and axial pressure gradients are fully considered in this analysis. Thus, it is anticipated that it, unlike the previous linearized analysis, is directly applicable also to turbulent, externally pressurized, and hybrid bearings.
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      A Theory for Turbulent Fluid Films and Its Application to Bearings

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/122946
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    contributor authorH. G. Elrod
    contributor authorC. W. Ng
    date accessioned2017-05-09T00:01:06Z
    date available2017-05-09T00:01:06Z
    date copyrightJuly, 1967
    date issued1967
    identifier issn0742-4787
    identifier otherJOTRE9-28539#346_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/122946
    description abstractIn this paper a new turbulent lubrication analysis has been derived which takes into account certain well-established facts concerning turbulent shear flow. Consistent with lubrication-film theory, the nature of the local flow is taken to depend only on local film thickness, surface velocity, and pressure gradients. An eddy diffusivity treatment is used which incorporates the “law of wall” with the use of local (within the film) shear stress. Stress reversal phenomena are accommodated and isotropy of the turbulent exchange mechanism in the plane of the film is assured. Coefficients are developed for use in the generalized Reynolds (lubrication) equation, and computation procedures for the static and dynamic characteristics of turbulent, self-acting bearings have been prepared. The nonlinear effects due to the coupling of the shear induced flows and the flows due to the circumferential and axial pressure gradients are fully considered in this analysis. Thus, it is anticipated that it, unlike the previous linearized analysis, is directly applicable also to turbulent, externally pressurized, and hybrid bearings.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Theory for Turbulent Fluid Films and Its Application to Bearings
    typeJournal Paper
    journal volume89
    journal issue3
    journal titleJournal of Tribology
    identifier doi10.1115/1.3616989
    journal fristpage346
    journal lastpage362
    identifier eissn1528-8897
    treeJournal of Tribology:;1967:;volume( 089 ):;issue: 003
    contenttypeFulltext
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