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Research Papers: Hydrodynamic Lubrication

Operation Parameters' Effect on Gaseous Bubbles in Lubricant of Groove Textured Journal Bearing

[+] Author and Article Information
F. M. Meng

The State Key Laboratory
of Mechanical Transmission,
Chongqing University,
Chongqing 400044, China
e-mail: fmmeng@cqu.edu.cn

L. Zhang

College of Mechanical Engineering,
Chongqing University,
Chongqing 400044, China
e-mail: zl00@cqu.edu.cn

T. Long

The State Key Laboratory
of Mechanical Transmission,
Chongqing University,
Chongqing 400044, China
e-mail: youshide@qq.com

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received August 3, 2016; final manuscript received February 3, 2017; published online May 26, 2017. Editor: Michael Khonsari.

J. Tribol 139(5), 051707 (May 26, 2017) (10 pages) Paper No: TRIB-16-1240; doi: 10.1115/1.4036170 History: Received August 03, 2016; Revised February 03, 2017

Operation parameter influences on the behavior of the gaseous bubble in the lubricant for a groove textured journal bearing are studied under the consideration of the thermal effect of the bearing–shaft system. The influence is analyzed by simultaneously solving Rayleigh–Plesset (RP), energy, and Reynolds equations. The computer code for the analyzing the bubble behavior is validated. Numerical results show that appropriately increasing the width–diameter ratio of the bearing and rotational speed of the shaft, or decreasing the applied load and inlet temperature of the lubricant, can decrease the maximum radius, collapse pressure, and temperature of the bubble.

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Figures

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Fig. 1

Schematic diagrams of textured bearing and groove: (a) schematic diagrams of textured bearing, (b) schematic of grooved middle section of bearing, and (c) schematic of groove

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Fig. 2

Flowchart of the solution

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Fig. 3

Comparisons between pressures and temperatures on bearing inner surface obtained by present study and in literature [17]: (a) for pressure and (b) for temperature

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Fig. 4

Bubble radius at varied width–diameter ratio L/D: (a) L/D = 0.75, (b) L/D = 0.85, and (c)L/D = 0.9

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Fig. 5

Distribution of pressure at varied width–diameter ratio L/D (Z = L/2)

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Fig. 6

Pressure and temperature inside bubble at varied width–diameter ratio L/D: (a) pressure inside bubble and (b) temperature inside bubble

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Fig. 7

Distribution of temperature along radial direction of bearing

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Fig. 8

Bubble radius at varied load F (Z = L/2): (a) F = 2000 N, (b) F = 2300 N, (c) F = 2500 N, and (d) F = 2800 N

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Fig. 9

Distribution of film pressure and temperature at varied load F: (a) for pressure and (b) for temperature

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Fig. 10

Pressure inside bubble at different loads

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Fig. 11

Temperature inside bubble at different loads

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Fig. 12

Distribution of bubble at varied rotational speed n: (a) n = 15,000 rpm, (b) n = 25,000 rpm, (c) n = 30,000 rpm, and (d) n = 35,000 rpm

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Fig. 13

Pressure and temperature inside bubble at varied rotational speed n: (a) pressure inside bubble and (b) temperature inside bubble

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Fig. 14

Distribution of bubble at varied bubble at varied inlet temperature T0: (a) T0 = 25 °C, (b) T0 = 30 °C, (c) T0 = 35 °C, and (d) T0 = 40 °C

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Fig. 15

Distribution of film pressure at varied inlet temperature T0

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Fig. 16

Pressure and temperature inside bubble at varied inlet temperature T0: (a) pressure inside bubble and (b) temperature in bubble

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