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Research Papers: Hydrodynamic Lubrication

A Comparative Thermal Analysis of Slot-Entry and Hole-Entry Hybrid Journal Bearings Lubricated With Non-Newtonian Lubricant

[+] Author and Article Information
H. C. Garg

Department of Mechanical Engineering, Guru Jambheshwar University of Science and Technology, Hisar-125001, Indiahc_garg@yahoo.co.in

Vijay Kumar

Department of Mechanical Engineering, Rayat-Bahara College of Engineering and Nano-Technology for Women, Hosiarpur-146001, India

H. B. Sharda

Department of Mechanical Engineering, Sri Sai College of Engineering and Technology, Badhani-Pathankot 145 001, India

J. Tribol 132(4), 041701 (Sep 10, 2010) (11 pages) doi:10.1115/1.4002034 History: Received June 12, 2009; Revised May 30, 2010; Published September 10, 2010; Online September 10, 2010

The effect of viscosity variation due to temperature rise and non-Newtonian behavior of the lubricant on the performance of hole-entry and slot-entry hybrid journal bearings system is the focus of this investigation. The performance characteristics of nonrecessed hybrid journal bearings operating with different flow controlling devices, i.e., constant flow valve, capillary, orifice, and slot restrictors, have been compared. Finite element method has been used to solve the Reynolds equation governing the flow of lubricant in the bearing clearance space along with the restrictor flow equation, energy equation and conduction equation using suitable iterative technique. The non-Newtonian lubricant has been assumed to follow the cubic shear stress law. The results indicate that variation in viscosity due to rise in temperature and non-Newtonian behavior of the lubricant affects the performance of nonrecessed hybrid journal bearing system quite significantly. The results further indicate that bearing performance can be improved by selecting a particular bearing configuration in conjunction with a suitable compensating device.

Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Hole-entry hybrid journal bearing geometry and coordinate system: (a) symmetric configuration, (b) asymmetric configuration, and (c) coordinate system

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Figure 2

Slot-entry hybrid journal bearing geometry and coordinate system (a) symmetric configuration, (b) asymmetric configuration, and (c) coordinate system

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Figure 4

Comparison of load carrying capacity of symmetric hole-entry journal bearing (capillary)

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Figure 5

Comparison of load carrying capacity of symmetric slot-entry journal bearing.

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Figure 6

Comparison of h¯min: symmetric configurations

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Figure 7

Comparison of h¯min: asymmetric configurations

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Figure 8

Comparison of Q¯: symmetric configurations

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Figure 9

Comparison of Q¯: asymmetric configurations

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Figure 10

Comparison of M¯c: symmetric configurations

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Figure 11

Comparison of M¯c: asymmetric configurations

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Figure 12

Comparison of ω¯th: symmetric configurations

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Figure 13

Comparison of ω¯th: asymmetric configurations

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Figure 14

Comparison of maximum temperature of midfilm: symmetric configurations

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Figure 15

Comparison of maximum temperature of midfilm: asymmetric configurations

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Figure 16

Variation in midfilm temperature with α for symmetric and asymmetric configurations

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