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3 edition of On the performance of finite journal bearings lubricated with micropolar fluids found in the catalog.

On the performance of finite journal bearings lubricated with micropolar fluids

On the performance of finite journal bearings lubricated with micropolar fluids

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Published by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, D.C.], [Springfield, Va .
Written in English

    Subjects:
  • Bearings (Machinery)

  • Edition Notes

    StatementM.M. Khonsari and D.E. Brewe.
    SeriesNASA technical memorandum -- 100293., AVSCOM technical report -- 88-C-001., AVSCOM technical report -- 88-C-1.
    ContributionsBrewe, David E., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15281231M

    On the Performance of Finite Journal Bearings Lubricated with Micropolar Fluids, STLE Tribology Transactions, Vol, No.2, pp–60, Das, S., Steady State and Dynamic Analysis including Stability of Hydrodynamic Journal Bearings with Micropolar Lubrication, Doctoral Thesis, Bengal Engineering and Science University, Shibpur, – The performance of finite circular journal bearing lubricated with micropolar fluids taking into account the elastic deformation of the bearing liner is presented. The paper aims to discuss these issues., – The modified Reynolds equation is obtained using the micropolar lubrication theory. The solution of the modified Reynolds equation is determined using finite difference ://

      The theoretical study of the effect of surface roughness on the squeeze film lubrication of short journal bearings with no journal rotation under fluctuating loads with micropolar fluids is made. A more general form of surface roughness is mathematically modelled by a stochastic random variable with non-zero mean, variance, and :// {14} S. Das, S.K. Guha, A.K. Chattopadhyay, On the steady-state performance of misaligned hydrodynamic journal bearings lubricated with micropolar fluids, Tribology International 35 () Google Scholar Cross Ref {15} E. Albert Yousif, Somer M. Nacy, Hydrodynamic behaviour of two-phase (liquid-solid) lubricants, Wear 66 ()

    The aim of the present study is to theoretically determine the steady state characteristics of hydrodynamic oil journal bearings considering the effect of deformation of liner and with micropolar lubrication. Modified Reynolds equation based on micropolar lubrication theory is solved using finite difference method to obtain steady state film :// S. Das, S.K. Guha, A.K. Chattopadhyay, On the steady-state performance of misaligned hydrodynamic journal bearings lubricated with micropolar fluids. J. Tribol. Int.


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On the performance of finite journal bearings lubricated with micropolar fluids Download PDF EPUB FB2

On the Performance of Finite Journal Bearings Lubricated With Micropolar Fluids - (EASA-TM) -~ CY 'IbE EEbECEPAbCE' OP N E3 EIYITE JCURNAL EEdGIIGS LOEGICAILD LITB IPCBC€OLAfi PLCIES (N1SA) 22 F CSCL 20D Unclas G3/34 M.M.

Khonsari University of Pittsburgh Pittsburgh, Pennsylvania and D.E. Brewe Propulsion Directorate A study of the performance parameters for a journal bearing of finite length lubricated with micropolar fluids is undertaken.

Results indicate that a significantly higher load carrying capacity   A study of the performance parameters for a journal bearing of finite length lubricated with micropolar fluids is undertaken. Results indicate that a significantly higher load carrying capacity than Newtonian fluids may result depending on the size of material characteristic length and A study of the performance parameters for a journal bearing of finite length lubricated with micropolar fluids is undertaken.

Results indicate that a significantly higher load carrying capacity than the Newtonian fluids may result depending on the size of material characteristic length and the coupling number. It is also shown that although the frictional force associated with micropolar fluid K/abstract.

The results obtained from the solution for the steady-state characteristics of finite journal bearings with micropolar fluids indicate a significantly higher load capacity and lower friction coefficient than Newtonian fluids depending on the size of characteristic length and the coupling number of the micropolar :// The performance of finite width journal bearings lubricated with micropolar fluids is analysed by using, directly, the finite difference method to solve the generalized three-dimensional Reynolds ://   The problem to be considered is a finite grooved journal bearing lubricated with micropolar fluids.

As shown in Fig. 1, in the converging passage, there is a pressure buildup to support the applied load, while in the diverging passage, the fluid film will cavitate into a bunch of streamers when the pressure drops below the saturation pressure of the dissolved ://   performance of finite hydrodynamic journal bearings.

Later on, a few investigations have dealt with the elastohydrodynamic effect (Oh and Huebner, ; and Jain et al., ) in the field of lubricated journal bearings. However, so far there is no investigation available that addresses the effect of elastic deformation of bearing surface on   The double-layered porous journal bearings hold proactive application on the field that demanded comparatively high stability and stiffness.

The performance characteristics of micropolar fluid lubricated double porous layered journal bearing is investigated theoretically by using Darcy's law of fluid flow through a porous ://   The combined effects of fully surface textured with micropolar fluids reduce the performance of journal bearing, especially at lower eccentricity ratios.

On the performance of finite journal bearings lubricated with NB, Kashinath, B. Surface roughness effects on the static and dynamic behaviour of squeeze film lubrication of short   Huang analyzed theoretically the performance of finite width journal bearings lubricated with micropolar fluids using finite difference method.

It was reported that at higher operating eccentricity ratio, a bearing operating with micropolar lubricants shows an increase in load carrying capacity and reduction in the value of coefficient of :// Abstract.

A study of the performance parameters for a journal bearing of finite length lubricated with micropolar fluids is undertaken. Results indicate that a significantly higher load carrying capacity than the Newtonian fluids may result depending on the size of material characteristics length and CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The present work deals with the micro-polar ferro fluid lubrication theory to the problem of the static characteristics of finite flexible journal bearings.

Based on a magnetic field distribution with a gradient in both circumferential and axial directions, a modified Reynolds equation has been derived by ?doi= 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 :// Elastohydrodynamic circular and elliptical journal bearings lubricated with micropolar lubricant have been analyzed by Prabhakaran Nair et al.

9, 10 The results obtained from their analysis The aim of the present paper is to study theoretically, using finite difference techniques, the stability characteristics of hydrodynamic journal bearings lubricated with micropolar :// Two-lobe pressure dam bearings are commonly used in high speed rotating machineries.

Their use is considered more stable than plain cylindrical bearings. Such bearings have a dam in the upper half whereas the lower half is provided with a relief track. Performance of two-lobe pressure dam bearings under micropolar fluid is evaluated. Finite element method is used to solve the modified Reynolds   Gautam et al [12] and Das et al [14] carried out the theoretical investigation on the static performance characteristics of journal bearings under micropolar lubrication with turbulent effect.

Recently, Rana et al [15] conducted approximate dynamic analysis of short journal bearings operating with micropolar lubrication in turbulent :// The present paper deals with a theoretical analysis of 4-pocket capillary compensated conical hybrid journal bearing system operating with micropolar lubricant.

The modified Reynolds equation for a conical journal bearing system operating with micropolar lubricant has been derived. In the present study, Eringen's micropolar theory has been used to model micropolar lubrication in cylindrical   In this paper, steady-state and stability performance characteristics of circular and noncircular two- three- and four-lobe journal bearings with micropolar fluids are presented.

For this purpose, lubricating oil containing additives and contaminants is modeled as micropolar ://. A numerical study of the performance for a dynamically loaded journal bearing lubricated with couple stress fluids is undertaken.

First of all, on the basis of micro-continuum theory, the Get this from a library! On the performance of finite journal bearings lubricated with micropolar fluids.

[Mansour Mohammadian Khonsari; D E Brewe; United States. National Aeronautics and The present paper describes the performance of a capillary compensated hole-entry hydrostatic/hybrid symmetric journal bearing system operating with micropolar lubricant.

The numerical solution of the modified Reynolds equation governing the flow of the micropolar lubricant is obtained using finite