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  • 1990-1994  (8)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Effect of viscous dissipation on the lubrication characteristics of micropolar fluids (1994)
    Springer
    Acta mechanica 105 (1994), S. 57-68 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Thermohydrodynamic solutions are presented for a finite journal bearing lubricated with micropolar fluid. Comparison with isothermal results, assuming that viscosity remains at the inlet temperature, is also given. Results indicate the heat generation due to viscous dissipation plays an important role on the load-carrying of a journal bearing lubricated with micropolar fluids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01183942
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    On the self-excited whirl orbits of a journal in a sleeve bearing lubricated with micropolar fluids (1990)
    Springer
    Acta mechanica 81 (1990), S. 235-244 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Whirl orbits of a shaft in a finite journal bearing lubricated with micropolar fluid is predicted by numerical computation of the generalized Reynolds equation and the equations of shaft motion. Comparing to Newtonian fluids, some stabilizing effects due to fluids with micropolar characteristics is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01176991
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Effect of viscous dissipation on the lubrication characteristics of micropolar fluids (1994)
    Springer
    Details
    Publication Date: 1994-03-01
    Print ISSN: 0001-5970
    Electronic ISSN: 1619-6937
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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    PAPER CURRENT
  • 4
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    On the self-excited whirl orbits of a journal in a sleeve bearing lubricated with micropolar fluids (1990)
    Springer
    Details
    Publication Date: 1990-09-01
    Print ISSN: 0001-5970
    Electronic ISSN: 1619-6937
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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    PAPER CURRENT
  • 5
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    Unknown
    On the mixture flow problem in lubrication of hydrodynamic bearings - Small solid volume fraction (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The lubrication problem of infinitely long slider bearings with a mixture of fluid and particulate solid at small volume fraction level is studied. Closed-form analytical solutions for pressure and shear stress are obtained for a class of solid aggregates. The results reduce to those of pure fluid in the limiting case. A parametric study of the bearing performance with particulate solid is presented.
    Keywords: MECHANICAL ENGINEERING
    Type: STLE Tribology Transactions (ISSN 0569-8197); 35; 45-52
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    On the solution of a lubrication problem with particulate solids (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The lubrication characteristic of a fluid with solid particles is studied using the continuum theory of mixtures. The governing equations are formulated and appropriate boundary conditions are introduced for an arbitrary-shaped lubricant film thickness. As a special case, closed-form analytical perturbation solutions for pressure and shear stress are obtained for a mixture of a conventional oil and solid particles with small values of solid-volume fraction sheared in the clearance space of an infinitely long slider bearing. It is found that when compared with a pure fluid, the mixture of the fluid and solid generates a higher pressure and therefore a higher load-carrying capacity with the added advantage of a reduction in the coefficient of friction.
    Keywords: MECHANICAL ENGINEERING
    Type: International Journal of Engineering Science (ISSN 0020-7225); 29; 9, 19; 1019-103
    Format: text
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  • 7
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    Current research in cavitating fluid films (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A review of the current research of cavitation in fluid films is presented. Phenomena and experimental observations include gaseous cavitation, vapor cavitation, and gas entrainment. Cavitation in flooded, starved, and dynamically loaded journal bearings, as well as squeeze films are reviewed. Observations of cavitation damage in bearings and the possibility of cavitation between parallel plates with microasperities were discussed. The transcavity fluid transport process, meniscus motion and geometry or form of the film during rupture, and reformation were summarized. Performance effects were related to heat transfer models in the cavitated region and hysteresis influence on rotor dynamics coefficients. A number of cavitation algorithms was presented together with solution procedures using the finite difference and finite element methods. Although Newtonian fluids were assumed in most of the discussions, the effect of non-Newtonian fluids on cavitation was also discussed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-103184 , E-4924 , NAS 1.15:103184 , AD-A230773
    Format: application/pdf
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  • 8
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    A continuum theory of a lubrication problem with solid particles (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The governing equations for a two-dimensional lubrication problem involving the mixture of a Newtonian fluid with solid particles at an arbitrary volume fraction are developed using the theory of interacting continuua (mixture theory). The equations take the interaction between the fluid and the particles into consideration. Provision is made for the possibility of particle slippage at the boundaries. The equations are simplified assuming that the solid volume fraction varies in the sliding direction alone. Equations are solved for the velocity of the fluid phase and that of the solid phase of the mixture flow in the clearance space of an arbitrary shaped bearing. It is shown that the classical pure fluid case can be recovered as a special case of the solutions presented. Extensive numerical solutions are presented to quantify the effect of particulate solid for a number of pertinent performance parameters for both slider and journal bearings. Included in the results are discussions on the influence of particle slippage on the boundaries as well as the role of the interacting body force between the fluid and solid particles.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME, Transactions, Journal of Applied Mechanics (ISSN 0021-8936); 60; 1; p. 48-58.
    Format: text
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    NASA TECHNICAL REPORTS
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