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RESEARCH PAPERS

On the Role of Enduring Contact in Powder Lubrication

[+] Author and Article Information
J. Y. Jang

Department of Mechanical Engineering, 2508 CEBA,  Louisiana State University, Baton Rouge, LA 70803

M. M. Khonsari

Department of Mechanical Engineering, 2508 CEBA,  Louisiana State University, Baton Rouge, LA 70803Khonsari@me.lsu.edu

J. Tribol 128(1), 168-175 (Jul 07, 2005) (8 pages) doi:10.1115/1.2114933 History: Received March 04, 2005; Revised July 07, 2005

This paper is devoted to a study of the enduring contact between granules of powder lubricants in an effort to better understand the flow characteristics of powder lubricants. Appropriate formulation of the governing equations is reported that can be used for prediction of the flow velocity, pseudo temperature, and volume fraction distribution of powders for a wide range of operating speeds. A set of parametric simulations and a limiting analytical solution is presented for predicting the behavior of a powder lubricant under low operating speeds when the enduring contact tends to dominate the kinetic regime. The limiting solution shows that below a certain sliding speed the volume fraction remains unchanged due to the effect of the enduring contact. It is also shown that below this limiting speed the enduring contact plays a major role and should not be neglected.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic model of a powder lubrication system sheared between two plates

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Figure 2

Velocity, pseudo temperature, volume fraction, and the shear stress distributions without the consideration of the enduring contact

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Figure 3

Velocity, pseudo temperature, volume fraction, and the shear stress distributions with the consideration of the enduring contact

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Figure 4

Variation of the friction coefficient with sliding speed

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Figure 5

Limiting solution of volume fraction and pseudo temperature with sliding speed

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Figure 6

Variation of the friction coefficient with load

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Figure 7

Limiting solution of volume fraction and pseudo temperature with load

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Figure 8

Limiting solution when the enduring contact is dominant

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Figure 9

Trend of the friction coefficient with sliding speed and load

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