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Research Papers: Hydrodynamic Lubrication

Optimal Parameters of Grooved Conical Hybrid Journal Bearing With Shear Thinning and Piezo-viscous Lubricant Behavior

[+] Author and Article Information
Abhishek Kumar

Department of Mechanical and Industrial Engineering,
Indian Institute of Technology Roorkee,
Uttarakhand 247667, India
e-mail: akumar26@me.iitr.ac.in

Satish C. Sharma

Department of Mechanical and Industrial Engineering,
Indian Institute of Technology Roorkee,
Uttarakhand 247667, India
e-mail: sshmefme@iitr.ac.in

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the Journal of Tribology. Manuscript received January 30, 2019; final manuscript received April 6, 2019; published online May 9, 2019. Assoc. Editor: Stephen Boedo.

J. Tribol 141(7), 071702 (May 09, 2019) (13 pages) Paper No: TRIB-19-1049; doi: 10.1115/1.4043507 History: Received January 30, 2019; Accepted April 06, 2019

To harness higher axial load capacity, a larger cone angle is used in conical bearings, resulting in an increase in the surface area which in turn increases the frictional power loss. The use of microgrooves in journal bearing helps in controlling this loss. Therefore, the present work is aimed to analyze conical hybrid journal bearing (i.e., combination of hydrostatic and hydrodynamic modes of operation) consisting of microgrooves along with shear thinning and piezo-viscous behavior of the lubricant. In this study, the microgroove attributes have been optimized by obtaining the solution of a Reynolds equation using finite element method and generalized minimum residual scheme (GMRES). These optimized groove attributes are used for numerically simulating the performance of the conical bearings. It has been observed that the best features of microgrooves and shear thinning behavior of the lubricant can be extracted to achieve better performance of the bearings. The results presented in this study are believed to be beneficial to the bearing designers and practising lubrication engineers.

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Figures

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Fig. 1

Schematic view of conical hybrid journal bearing: (a) coordinate system, (b) 3D view of grooved conical bearing, (c) conical hybrid journal bearing with the orifice restrictor, (d) developed surface of microgrooved bearing, and (e) cross-sectional geometry of different shapes of grooves

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Fig. 2

Lubricant behavior with respect to viscosity versus shear rate

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Fig. 3

Grid convergence study

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Fig. 4

Computational flowchart of conical hybrid journal bearing

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Fig. 5

Validation of the grooved surface, conical bearing, and the shear thinning fluid: (a) validation of the grooved surface, (b) validation of conical bearing, and (c) validation of the shear thinning fluid

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Fig. 6

Different configurations of the grooved surface of conical bearing (λ = 1, b = 0.25, β* = 0.5, ΩN = 1, g = 1, g = 0.25, gr = 1, and g = 6)

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Fig. 7

Radial load versus different configurations (λ = 1, b = 0.25, β* = 0.5, ΩN = 1, g = 1, g = 0.25, gr = 1, and g = 6)

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Fig. 8

Radial load versus number of grooves in between restrictors (λ = 1, b = 0.25, β* = 0.5, ΩN = 1, g = 1, g = 0.25, gr = 1, and g = 6)

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Fig. 9

Parametric study of groove attributes: (a) radial load (R) versus depth of the groove (g), (b) radial load (R) versus width of the groove (g), (c) radial load (R) versus reference length of the groove (gr), and (d) radial load (R) versus location of the groove with respect to the restrictor

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Fig. 10

Understanding reference length of the groove (gr)

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Fig. 11

Axial load (A) versus radial load (R)

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Fig. 12

Minimum fluid film thickness (min) versus radial load (R)

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Fig. 13

Fluid film frictional power loss (fric) versus radial load (R)

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Fig. 14

Lubricant flow rate () versus radial load (R)

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Fig. 15

Distribution of pressure at radial load (R) = 0.8, 1.0, 1.2 with different cases of microgroove (rectangular shape) and shear thinning lubricant (λ = 1, b = 0.25, β* = 0.5, ΩN = 1.411, g = 1, g = 0.4, and g = 5)

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Fig. 16

Distribution of lubricant viscosity (μ¯(γ˙¯)) at radial load (R) = 0.8, 1.0, 1.2 with different cases of microgroove (rectangular shape) and shear thinning lubricant (λ = 1, b = 0.25, β* = 0.5, ΩN = 1.411, g = 1, g = 0.4, and g = 5)

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Fig. 17

Fluid film stiffness coefficients (xx, yy, and zz) versus radial load (R)

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Fig. 18

Fluid film damping coefficients (xx, yy, and zz) versus radial load (R)

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