Rheodynamic lubrication of a squeeze film bearing under sinusoidal squeeze motion

Kandasamy, A.; Vishwanath, K.

doi:10.1590/s0101-82052007000300004

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…Usha and Vimala discussed inertia effects in a circular squeeze film bearing containing central air bubbles (Usha and Vimala, 2000). Kandasamy and Vishwanath have studied the combined effect of fluid inertia and Bingham lubricant in a squeeze film bearing under sinusoidal squeeze motion of circular plates (Kandasamy and Vishwanath, 2007). Walicka et.…”

Section: Introductionmentioning

confidence: 99%

Inertia Effects in Rheodynamic Lubrication of an Externally Pressurized Converging Thrust Bearing using Bingham Fluids

Raymand¹,

Amalraj²

2019

JAFM

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Thrust bearing are innately developed to withstand axial load. When the bearing is subjected to high speed operations, heavy load, high stiffness etc., suggesting a change in the design of the bearing plays a vital role in its performance. Friction is developed between the circular plates while the bearing operates. To reduce this friction, the bearing is lubricated with lubricants such as mineral oil, greases etc., Generally, lubricants are classified into two types that is Newtonian and non-Newtonian. However, non-Newtonian fluids characterized by an yield value such as Bingham, Casson and Herschel Bulkley, are attracting the tribologists, at present. And also, the study of fluid inertia on thrust bearing is required to optimize the performance of the bearings. In this investigation, we have ventured to analyze the performance of the bearing by considering the combined effects of fluid inertia forces and non-Newtonian characteristic with Bingham fluid as lubricant in an externally pressurized converging circular thrust bearing. Such studies will be useful in the design of the bearing for the optimum performance using the appropriate lubricant in various machineries operating in an extreme condition in the industries. Averaging the inertia terms over film thickness and defining a modified pressure gradient, the rheodynamic lubrication equation containing inertia terms has been analyzed. Using the appropriate boundary conditions and considering externally pressurized flow in narrow clearance between two converging discs is symmetric w.r.t r and z axis, the velocity distributions, the modified pressure gradient and thereby the film pressure and the load capacity of the bearing have been obtained numerically for different values of Bingham number, Reynolds number and angle of convergence. In addition to that, the effects of the inertia forces, non-Newtonian characteristics and angle of convergence on the bearing performances have been discussed.

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Section: Introductionmentioning

confidence: 99%

Inertia Effects in Rheodynamic Lubrication of an Externally Pressurized Converging Thrust Bearing using Bingham Fluids

Raymand¹,

Amalraj²

2019

JAFM

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“…To analyze the effects of sinusoidal motion of the bearing, Usha and vimala (2002) have applied the energy integral approach to find the behaviour of curved squeeze film bearing using Newtonian lubricant. Kandasamy and Vishwanath (2007) have discussed the effects of fluid inertia forces, non-Newtonian characteristics and the amplitudes of sinusoidal squeeze motion on the bearing performances using Bingham fluid. Even though Jayakaran Amalraj et al (2012) has analyzed the performance of an externally pressurized thrust bearing using Herschel -Bulkley fluids with sinusoidal injection recently, they have not considered the inertial effects in their study.…”

Section: Introductionmentioning

confidence: 99%

Inertia Effects in Rheodynamic Lubrication of an Externally Pressurized Thrust Bearing Using Bingham Lubricant with Sinusoidal Injection

Amalraj¹,

Narasimman²,

Kandasamy³

2013

JAFM

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In the present theoretical investigation, the combined effects of fluid inertia forces and sinusoidal injection of the Bingham lubricant, on the performance of an externally pressurized thrust bearing with circular geometry are studied. Using the conventional two-constant Bingham model and by adopting the method of averaging inertia terms, the reduced Navier-Stokes equations are modified and numerical solutions have been obtained for the bearing performances such as the pressure distribution and the load carrying capacity for different values of Bingham number, Reynolds number, time and amplitude. The effects of fluid inertia forces and the non-Newtonian characteristics of the Bingham lubricant on the bearing performances for different sinusoidal conditions are discussed.

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“…With sinusoidal squeeze motion, Usha et al (2002) have applied the energy integral approach to find the behaviour of curved squeeze film bearing using Newtonian lubricant. Kandasamy et al (2007) have discussed the effects of fluid inertia, non-Newtonian characteristics and the amplitudes of sinusoidal squeeze motion on the bearing performances of a squeeze film bearing using Bingham fluid. Recently, Amalraj et al (2010) have analyzed the bearing performances in an externally pressurized thrust bearing using Bingham fluids with sinusoidal injection of the lubricant.…”

Section: Introductionmentioning

confidence: 99%

Rheodynamic Lubrication of an Externally Pressured Thrust Bearing Using Herschel-Bulkley Fluid with Sinusoidal Injection

Amalraj

Narasimman²,

Kandasamy³

2012

JAFM

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Lubricants with variable viscosity are assuming greater importance for its application in polymer industry, thermal reactors and in biomechanics. With the bearing operations in machines being subject to high speeds, loads, increasing mechanical shearing forces and continually increasing pressure, there has been an increasing interest to use non-Newtonian fluids characterized by a yield value. Some of them, which fit into this class, are Bingham, Casson and Herchel-Bulkley models. In the present work, the problem of an externally pressurized thrust bearing lubricated with Herschel-Bulkley fluid under the sinusoidal flow rate has been investigated. Herschel-Bulkley fluids are characterized by a yield value, which leads to the formation of rigid core in the flow region. The shape and extent of the core has been determined numerically for various values of the Herschel-Bulkley number, power-law index, amplitude of sinusoidal fluid film and time. Numerical solutions have been obtained for the bearing performances such as pressure distribution and load capacity for different values of the Herschel-Bulkley number, power-law index, amplitude of sinusoidal fluid film and time. The effects of sinusoidal injection of the lubricant and the non-Newtonian characteristics on the bearing performances have been discussed.

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Rheodynamic lubrication of a squeeze film bearing under sinusoidal squeeze motion

Abstract: Mathematical subject classification: 76A05, 76D08.

Cited by 5 publications

References 11 publications

Inertia Effects in Rheodynamic Lubrication of an Externally Pressurized Converging Thrust Bearing using Bingham Fluids

Inertia Effects in Rheodynamic Lubrication of an Externally Pressurized Converging Thrust Bearing using Bingham Fluids

Inertia Effects in Rheodynamic Lubrication of an Externally Pressurized Thrust Bearing Using Bingham Lubricant with Sinusoidal Injection

Rheodynamic Lubrication of an Externally Pressured Thrust Bearing Using Herschel-Bulkley Fluid with Sinusoidal Injection

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