Steady state and stability characteristics of a hydrodynamic journal bearing with a non-Newtonian lubricant

Swamy, S.T.N.; Prabhu, B.S.; Rao, B.V.A.

doi:10.1016/0043-1648(77)90054-0

Cited by 26 publications

(3 citation statements)

References 13 publications

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“…Hsu (3) has used cubic shear stress law ( T + k T 3 = j ) for the non-Newtonian lubricants and has studied the static performance characteristics for infinitely long bearings by expressing pressure and flow in terms of a power series. Wada and Hayashi (4)- (6) and Swami, Prabhu and Rao (7)- (9) have solved the modified Reynolds equation for a cubic shear stress law and have studied the performance characteristics for finite width bearings. Safar (10) has assumed a polynomial expansion for velocity for the derivation of a modified Reynolds equation and has obtained the load carrying capacity for different eccentricity ratios using a power law for the non-Newtonian flow.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Hydrodynamic Journal Bearings Having Non-Newtonian Lubricants (Prandtl Model) by a Finite Element Method

Tayal

Sinhasan

Singh

1981

Journal of Mechanical Engineering Science

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Additives are used to improve the performance of commercial lubricants. These lubricants behave like non-Newtonian fluids (shear thinning or shear thickening). The effect of the nonlinear behaviour on the performance characteristics of finite width journal bearings is investigated using the Prandtl model. The finite element method, using Galerkin's technique, has been used to solve the Navier-Stokes equations in cylindrical coordinates, representing the flow-field in the clearance space of a bearing using Newtonian fluids, and the non-Newtonian effect is introduced by modifying the viscosity term for the model in each iteration. Theresultsapplicable to shearthinning (pseudoplastic) and shear-thickening (dilatant) lubricants are compared with the established results for Newtonian lubricants.'

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Section: Introductionmentioning

confidence: 99%

Analysis of Hydrodynamic Journal Bearings Having Non-Newtonian Lubricants (Prandtl Model) by a Finite Element Method

Tayal

Sinhasan

Singh

1981

Journal of Mechanical Engineering Science

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“…Many extensions of this basic theory exist, including elastohydrodynamic lubrication [Greenwood (1972), Taylor and O'Callaghan (1972), Oh and Huebner (1973), LaBouff and Booker (1985), Jones (1993) [Constantinescu (1959), Ng (1964), Elrod and Ng (1967), Hirs (1973)], and lubrication of non-Newtonian fluids [Ng and Saibel (1962), Swamy et al (1977), Johnson1993, Bhattacharjee and Das (1996), Hryniewicz et al (2001), Nair et al (2007), Mongkolwongrojn and Aiumpronsin (2010)], among others [Christensen (1971), Eringen and Okada (1995), Feng and Weinbaum (2000), Stone (2005), Jang and Khonsari (2005), Bujurke and Kudenatti (2007), Rojas et al (2010)]. Recent books by Hori [Hori (2006)] and Szeri [Szeri (2010)] thoroughly review the history and applications of lubrication theory and derive the governing equations.…”

Section: Introductionmentioning

confidence: 99%

Nanomanufacturing : nano-structured materials made layer-by-layer.

Cox¹,

Cheng²,

Grest³

et al. 2011

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Large-scale, high-throughput production of nano-structured materials (i.e. nanomanufacturing) is a strategic area in manufacturing, with markets projected to exceed $1T by 2015. Nanomanufacturing is still in its infancy; process/product developments are costly and only touch on potential opportunities enabled by growing nanoscience discoveries. The greatest promise for high-volume manufacturing lies in age-old coating and imprinting operations. For materials with tailored nm-scale structure, imprinting/embossing must be achieved at high speeds (roll-to-roll) and/or over large areas (batch operation) with feature sizes less than 100 nm. Dispersion coatings with nanoparticles can also tailor structure through self-or directed-assembly. Layering films structured with these processes have tremendous potential for efficient manufacturing of microelectronics, photovoltaics and other topical nano-structured devices. This project is designed to perform the requisite 4 R&D to bring Sandia's technology base in computational mechanics to bear on this scale-up problem. Project focus is enforced by addressing a promising imprinting process currently being commercialized.5

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“…Samantaray et al [90] investigated the effect of two-phase (liquid-solid) lubricants on bearing stability and found that these fluids have the potential to provide stabilizing, spring-like forces in journal bearings to control whirl orbit size. A number of studies have also been published evaluating the effects of non-Newtonian, viscoelastic lubricants on bearing stability [91,92], load capacity [93], and minimum film thickness [94].…”

Section: Gas-expanded Lubricant Performance and Effects On Rotor Stabmentioning

confidence: 99%

Gas-Expanded Lubricants for Increased Energy Efficiency and Control in Rotating Machinery

Weaver¹

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Steady state and stability characteristics of a hydrodynamic journal bearing with a non-Newtonian lubricant

Cited by 26 publications

References 13 publications

Analysis of Hydrodynamic Journal Bearings Having Non-Newtonian Lubricants (Prandtl Model) by a Finite Element Method

Analysis of Hydrodynamic Journal Bearings Having Non-Newtonian Lubricants (Prandtl Model) by a Finite Element Method

Nanomanufacturing : nano-structured materials made layer-by-layer.

Gas-Expanded Lubricants for Increased Energy Efficiency and Control in Rotating Machinery

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