The influence of couple stresses in squeeze films

Bujurke, N. M.; Jayaraman, G.

doi:10.1016/0020-7403(82)90070-4

Cited by 77 publications

(46 citation statements)

References 6 publications

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“…Mokhiamer,et al (13) studied the performance of finite journal bearings lubricated with a couple stress fluid and found that the larger the chain length of the additive molecule, the greater the effect of the couple stresses. Lin (14), (15), Naduvinamani, et al (16), Naduvinamani and Patil (17), Ramanaiah (18), Crosby and Chetti (19), Nabhani,et al (20), and Bujurke and Jayaraman (21) have shown that the effect of couple stresses results in an increased load-carrying capacity and a longer response time.…”

Section: Introductionmentioning

confidence: 96%

Modified Reynolds Equation for Different Types of Finite Plates with the Combined Effect of MHD and Couple Stresses

Fathima

Naduvinamani

Hanumagowda³

et al. 2015

Tribology Transactions

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We make an effort to analyze the behavior of squeeze film characteristics of different finite plates with couple stress fluid in the presence of a transverse magnetic field. On the basis of the Stokes couple stress fluid model and hydromagnetic flow model, a modified Reynold's equation is derived, which is solved by using appropriate boundary conditions to obtain squeeze film pressure, load-carrying capacity, and squeeze film time. The graphical representation of the results suggests that the different bearing systems register an enhanced performance with couple stresses compared to that of a bearing system working with a conventional lubricant in the presence of a transverse magnetic field. It is observed that the effect of applied magnetic field on the squeeze film lubrication between different finite plates with conducting couple stress fluids is to increase the load-carrying capacity significantly and to delay the time of approach compared to the corresponding nonconducting Newtonian case. It is seen that for all of the finite plates of different shapes, the circular shape gives the maximum load and time.

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Section: Introductionmentioning

confidence: 96%

Modified Reynolds Equation for Different Types of Finite Plates with the Combined Effect of MHD and Couple Stresses

Fathima

Naduvinamani

Hanumagowda³

et al. 2015

Tribology Transactions

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“…Ramanaih [7] analyzed the squeeze film behaviour between finite plates of various shapes lubricated with couple stress fluids. Bujurke and Jayaraman [8] predicted the characteristics in a squeeze film configuration with reference to the synovial joint. Lin et al [9] studied the pure squeeze film behaviour of long partial journal bearings with couple stress fluids under dynamic loading.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Roughness and Viscosity-Pressure Dependency on the Couple Stress Squeeze Film Characteristics of Parallel Circular Plates

Naduvinamani

Apparao²,

Hiremath³

2014

Advances in Tribology

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Combined effects of surface roughness and viscosity-pressure dependency on the couple stress squeeze film characteristics of parallel circular plates are presented. On the basis of Christensen's stochastic theory, two types of one-dimensional roughness structures, namely, the radial roughness and azimuthal roughness patterns, are considered and the stochastic modified Reynolds equation for these two types of roughness patterns is derived for Stokes couple stress fluid by taking into account variation of viscosity with pressure. The standard perturbation technique is employed to solve the averaged Reynolds equation and closed form expressions for the mean fluid film pressure, load carrying capacity, and squeeze film time are obtained. It is found that the effects of couple stresses and viscosity-pressure dependency are to increase the load carrying capacity, and squeeze film time for both types of roughness patterns. The effect of azimuthal (radial) roughness pattern is to increase (decrease) these squeeze film characteristics as compared to the corresponding smooth case.

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“…The microcontinuum theory derived by Stokes [9] is the simplest generalization of the classical theory of fluids, which allows for polar effects such as the presence of antisymmetrical stresses, couple stress, and body couples. Many investigators have used couple stress fluid theory to analyze the performance of various bearing systems [10][11][12][13][14]. These studies have led to the predictions such as higher load carrying capacity, lower coefficient of friction, and delayed time of approach in comparison with the Newtonian case.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Roughness and Couple Stresses on Squeeze Films between Curved Annular Plates

Basti

2013

ISRN Tribology

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The combined effects of couple stresses and surface roughness patterns on the squeeze film characteristics of curved annular plates are studied. The Stokes (1966) couple stress fluid model is included to account for the couple stresses arising due to the presence of microstructure additives in the lubricant. In the context of Christensen's (1969) stochastic theory for the lubrication of rough surfaces, two types of one-dimensional roughness patterns (circumferential and radial) are considered. The governing modified stochastic Reynolds type equations are derived for these roughness patterns. Expressions for the mean squeeze film characteristics are obtained. Numerical computations of the results show that the circumferential roughness pattern on the curved annular plate results in more pressure buildup whereas performance of the squeeze film suffers due to the radial roughness pattern for both concave and convex pads. Further the squeeze film time is longer (shorter) for the circumferential (radial) roughness patterns. Improved squeeze film characteristics are predicted for the couple stress lubricant.

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The influence of couple stresses in squeeze films

Cited by 77 publications

References 6 publications

Modified Reynolds Equation for Different Types of Finite Plates with the Combined Effect of MHD and Couple Stresses

Modified Reynolds Equation for Different Types of Finite Plates with the Combined Effect of MHD and Couple Stresses

Effect of Surface Roughness and Viscosity-Pressure Dependency on the Couple Stress Squeeze Film Characteristics of Parallel Circular Plates

Effect of Surface Roughness and Couple Stresses on Squeeze Films between Curved Annular Plates

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