Journal bearing with non-Newtonian fluid in the area of Taylor vortices

Purpose Several researchers have observed that to satisfy modern day’s need, it is essential to enhance the characteristics of journal bearing, which is used in numerous applications. Moreover, the use of Newtonian fluid as a lubricant is diminishing day by day, and the use of Non-Newtonian fluids is coming more into picture. Furthermore, if turbo-machinery applications are taken into account, then it can be seen that journal bearings are used for high speed applications as well. Thus, neglecting turbulent conditions may lead to erroneous results. Hence, this paper aims to present focuses on studying the stability characteristics of finite hydrodynamic journal bearing under turbulent coupled-stress lubrication. Design/methodology/approach First, the governing equation relevant to the problem is generated. Then, the dynamic analysis is carried out by linear perturbation technique, leading to three perturbed equations, which are again discretized by finite difference method. Finally, these discretized equations are solved with the help of Gauss-Seidel Iteration technique with successive over relaxation scheme. Consequently, the film response coefficients and the stability parameters are evaluated at different parametric conditions. Findings It has been concluded from the study that with increase in value of the coupled-stress parameter, the stability of the journal may increase. Whereas, with increase in Reynolds number, the stability of the journal decreases. On the other hand, stability increases with increasing values of slenderness ratio. Originality/value Researches have been performed to study the dynamic characteristics of journal bearing with non-Newtonian fluid as the lubricant. But in the class of non-Newtonian lubricants, the use of coupled-stress fluid has not yet been properly investigated. So, an attempt has been made to perform the stability analysis of bearings with coupled-stress fluid as the advanced lubricant.

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Experimental Verification of a New Model for Transition Flow of Thin Films in Long Journal Bearings

STLE/ASME 2010 International Joint Tribology Conference ◽

10.1115/ijtc2010-41205 ◽

2010 ◽

Author(s):

Dingfeng Deng ◽

Minel J. Braun

Keyword(s):

Experimental Verification ◽

Journal Bearing ◽

Flow Behavior ◽

Journal Bearings ◽

Turbulent Regime ◽

Transition Flow ◽

New Model ◽

Taylor Vortices ◽

The Difference ◽

Good Agreement

A new model for predicting the flow behavior in long journal bearing films in the transition regime (Taylor and wavy vortex regimes) was previously proposed by the authors. This paper presents the experimental verification. A comparison between the experimental and numerical results of the Torque–Speed graphs is presented with good agreement between the numerical and experimental data for the Couette, Taylor and pre-wavy regimes. In the wavy and turbulent regime, the magnitude of the numerically obtained data is larger than the corresponding measured torques, but the difference is confined to below 14%. A comparison between experimental and numerical flow patterns is also presented. The results match well in general, except that experimentally, a pre-wavy regime was identified. The latter is characterized by the disappearance of the Taylor vortices, while numerically the Taylor vortices are only distorted and the wavy vortices are formed in this regime.

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Analysis of Magneto Rheological Fluid Journal Bearing

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.895.152 ◽

2019 ◽

Vol 895 ◽

pp. 152-157 ◽

Cited By ~ 1

Author(s):

B. Narasimha Rao ◽

A. Seshadri Sekhar

Keyword(s):

Magnetic Field ◽

Newtonian Fluid ◽

Carrying Capacity ◽

Smart Materials ◽

Journal Bearing ◽

Fluid Film ◽

Load Carrying Capacity ◽

Mr Fluid ◽

Load Carrying ◽

Magneto Rheological

Magneto Rheological (MR) fluids are a class of smart materials where the shear stress is not directly proportional to rate of shear. The viscosity of fluid changes as magnetic field changes and hence this phenomenon is very useful in bearing-rotor system for attenuating the vibrations. In the present study the application of MR fluid as lubricant instead of Newtonian fluid in the journal bearing is explored through steady state, dynamic characteristics and stability. MR fluid film has been modeled as per Bingham rheological model. FEM with three node triangular elements has been used to solve the Reynolds equation both for the Newtonian fluid film and MR fluid film. The results show the load carrying capacity in the case of MR fluid journal bearing is higher than that of using the Newtonian fluid. The load carrying capacity increases with the increasing magnetic field for all eccentricity ratios. The results also show better stability of the bearing using MR fluid at higher eccentricity ratios. The unbalance response of the rotor mounted on the journal bearing using MR fluid is also estimated to be lower than that of with the Newtonian fluid.

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Flow Transition Criteria in a Journal Bearing

Journal of Lubrication Technology ◽

10.1115/1.3451883 ◽

1974 ◽

Vol 96 (1) ◽

pp. 135-140 ◽

Cited By ~ 8

Author(s):

J. Freˆne ◽

M. Godet

Keyword(s):

High Speed ◽

Journal Bearing ◽

Flow Transition ◽

Clearance Ratio ◽

Taylor Vortices ◽

Torque Measurements ◽

Small Clearance ◽

Type Flow ◽

Turbulence Effects ◽

Transition Criteria

High speed Couette type flow was studied for small clearance ratios (C/R = 0.0055 and 0.0031). Water flow pattern visualiszations and torque measurements were performed. Results show that Taylor vortices occur at values predicted by theory, they precede turbulence effects and cause an increase in torque which depends on the clearance ratio. Transition between vortex and turbulent flow is gradual and appears to depend on the Taylor number. Taylor vortices can be found in plain bearings.

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Non-Newtonian Fluid Application of the Mobility Method in Engine Journal Bearing

International Journal of Automotive Technology ◽

10.1007/s12239-020-0123-7 ◽

2020 ◽

Vol 21 (5) ◽

pp. 1303-1313

Author(s):

Minje Park ◽

Siyoul Jang ◽

Kyoungdoug Min

Keyword(s):

Newtonian Fluid ◽

Journal Bearing ◽

Mobility Method

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Geometrical analysis of elliptical journal bearing lubricated with Newtonian fluid

10.1063/5.0050234 ◽

2021 ◽

Author(s):

Mrityunjay Kumar ◽

M. L. Chandravanshi ◽

P. C. Mishra

Keyword(s):

Newtonian Fluid ◽

Journal Bearing ◽

Geometrical Analysis

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A Thermohydrodynamic Analysis of Journal Bearings Lubricated by a Non-Newtonian Fluid

Journal of Tribology ◽

10.1115/1.3261644 ◽

1988 ◽

Vol 110 (3) ◽

pp. 414-420 ◽

Cited By ~ 8

Author(s):

A. Kacou ◽

K. R. Rajagopal ◽

A. Z. Szeri

Keyword(s):

Newtonian Fluid ◽

Journal Bearing ◽

Load Capacity ◽

Journal Bearings ◽

Temperature Dependent ◽

Temperature Dependent Viscosity ◽

Material Parameters ◽

Differential Type ◽

Dependent Viscosity ◽

Newtonian Behavior

Our earlier work on the flow of a non-Newtonian fluid of the differential type in a journal bearing is extended here to include nonisothermal operations and temperature dependent viscosity. We show that for the type of lubricant investigated, even a slight departure from Newtonian behavior renders the bearing performance relatively insensitive to changes in lubricant temperature. But whether this change in lubricant behavior actually results in improved load capacity depends on the value and the sign of the material parameters.

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Flow of a Fluid of the Differential Type in a Journal Bearing

Journal of Tribology ◽

10.1115/1.3261298 ◽

1987 ◽

Vol 109 (1) ◽

pp. 100-107 ◽

Cited By ~ 14

Author(s):

A. Kacou ◽

K. R. Rajagopal ◽

A. Z. Szeri

Keyword(s):

Newtonian Fluid ◽

Carrying Capacity ◽

Journal Bearing ◽

Lubrication Approximation ◽

Load Carrying Capacity ◽

Rotating Cylinders ◽

Load Carrying ◽

Differential Type

The flow of a homogeneous incompressible non-Newtonian fluid of the differential type between infinite eccentric rotating cylinders is discussed within the context of the lubrication approximation. The problem is studied by means of a perturbation and the effects of the non-Newtonian parameters are delineated. It is found that the load carrying capacity of the bearing can be significantly altered by the non-Newtonian character of the fluid.

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A Theory of Hydrodynamic Lubrication Involving the Mixture of Two Fluids

Journal of Applied Mechanics ◽

10.1115/1.2901507 ◽

1994 ◽

Vol 61 (3) ◽

pp. 634-641 ◽

Cited By ~ 19

Author(s):

F. Dai ◽

M. M. Khonsari

Keyword(s):

Continuum Mechanics ◽

Newtonian Fluid ◽

Journal Bearing ◽

Hydrodynamic Lubrication ◽

Incompressible Fluids ◽

Theoretical Development ◽

Governing Equations ◽

Power Law Fluid ◽

Two Fluids ◽

Special Cases

Based on the principles of continuum mechanics, we drive the governing equations for the hydrodynamic lubrication involving the mixture of two incompressible fluids. The governing equations are general in the sense that they can be applied to the mixture of any simple non-Newtonian fluid with a Newtonian fluid. A mixture thus formed is considered to be nonhomogeneous and non-Newtonian. In the theoretical development, the interaction between the constituents is taken into consideration. It is shown that a number of currently available models are special cases of the theory presented in this paper. As an example, results are presented for journal bearing performance lubricated with a mixture of a power-law fluid mixed with Newtonian oil.

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