Static and dynamic characteristics of finite exponential film shaped slider bearings lubricated with micropolar fluid

Tribology - Materials, Surfaces & Interfaces

Siddangouda²,

Patil³

2017

Self Cite

The effect of surface roughness on static and dynamic characteristics of parabolic slider bearing lubricated with couple stress fluid in the presence of magnetic field is theoretically analysed in this paper. The modified stochastic MHD couple stress Reynolds-type equation is derived on the basis of Christensen stochastic theory and considered two types of roughness pattern namely longitudinal and transverse. Expressions for steady pressure and load, dynamic stiffness and damping coefficients are obtained for both roughness patterns. Compared to smooth surface, transverse roughness pattern provides larger load-carrying capacity, dynamic stiffness and damping coefficients, whereas longitudinal roughness pattern has adverse effects. The presence of couple stress and applied magnetic field improves the bearing performance.

Section: Introductionmentioning

confidence: 99%

Effect of surface roughness on static and dynamic characteristics of MHD couple stress lubrication of parabolic slider bearing

Tribology - Materials, Surfaces & Interfaces

Siddangouda²,

Patil³

2017

Self Cite

“…Naduvinamani and Marali [15] derived the dynamic Reynolds equation for micropolar fluid lubrication of porous slider bearings. Later, Naduvinamani and Patil [16] derived the general dynamic Reynolds equation of exponential shaped slider bearing lubricated with micropolar fluid. Recently researchers are interested in the study of the surface roughness Japanese Society of Tribologists (http://www.tribology.jp/) N. B. Naduvinamani and Ashwini Angadi effects on bearings as the surface roughness is inherent in the process used for their manufacture.…”

Section: Introductionmentioning

confidence: 99%

On the Dynamic Characteristics of Rough Porous Inclined Slider Bearing Lubricated with Micropolar Fluid

Angadi

2022

Tribology Online

In this paper, an investigation has been made to study the dynamic characteristics of porous inclined slider bearing with rough surface lubricated with micropolar fluid lubricant. On the basis of Eringen's micro-continuum theory, the Reynolds type equation of porous slider bearing is derived by considering rough surface and squeezing action to evaluate dynamic characteristics of slider bearing. Perturbation method has been used for detailed analysis. Reynolds type equations are obtained for steady performance and perturbed characteristics. The solutions of these equations are obtained. According to the results, an increase (decrease) in the load carrying capacity, dynamic stiffness and damping coefficient are observed for the negatively (positively) skewed surface roughness.

“…The effect of couple stress fluid on the dynamic characteristics of wide exponential-shaped slider bearings and wide Rayleigh step slider bearings was presented by Lin et al [28,29]. Naduvinamani and Patil [30] derived the dynamic Reynolds equation for micropolar fluid to study the dynamic characteristics of a finite exponential-shaped slider bearing. Singh and Gupta [31] theoretically investigated the effect of ferrofluid using the shliomis model on the dynamic characteristics of curved slider bearings.…”

Section: Introductionmentioning

confidence: 99%

Static and Dynamic Characteristics of Rough Porous Rayleigh Step Bearing Lubricated with Couple Stress Fluid

Angadi

2022

Lubricants

In tribology, the Rayleigh step bearing has the maximum load capacity of any feasible bearing geometry. Traditional tribology resources have demonstrated that the Rayleigh step has an ideal geometry which maximizes load capacity. Both in nature and technology, rough and textured surfaces are essential for lubrication. While surface roughness enhances the performance of the bearings as an efficiency measure, it still has a significant impact on the load-carrying capacity of the bearing. In the present study, we investigate the dynamic characteristics of the Rayleigh step bearing with the impact of surface roughness and a porous medium by considering a squeezing action. Couple stress fluid is considered a lubricant with additives in both the film as well as the porous region. Based on Stokes constitutive equations for couple stress fluids, Darcy’s law for porous medium, and stochastic theory for rough surfaces, the averaged Reynolds-type equation is derived. Expressions are obtained for the volume flow rate, steady-state characteristics, and dynamic characteristics. The influence of surface roughness and the porous medium on the Rayleigh step bearing is analyzed. We investigated the static and dynamic characteristics of the Rayleigh step bearing. As a result, the couple stress fluid increases (decreases) the steady load-carrying capacity, dynamic stiffness, and dynamic damping coefficients, and decreases (increases) the volume flow rate negatively (positively) skewed roughness in comparison with that of the Newtonian case. The results are compared with those of the smooth case.