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Elastohydrodynamic Lubrication

Experimental Investigation of Lubricant Flow Properties Under Micro Oil Supply Condition

[+] Author and Article Information
Shanhua Qian

State Key Laboratory of Tribology,  Tsinghua University, Beijing 100084, P. R. C.;  School of Mechanical Engineering, Jiangnan University, Wuxi 214122, P. R. C.

Dan Guo1

State Key Laboratory of Tribology,  Tsinghua University, Beijing 100084, P. R. C.guodan26@tsinghua.edu.cn

Shuhai Liu

 School of Mechanical and Electronic Engineering, China University of Petroleum, Beijing 102249, P. R. C.

Xinchun Lu

State Key Laboratory of Tribology,  Tsinghua University, Beijing 100084, P. R. C.

1

Corresponding author.

J. Tribol 134(4), 041501 (Aug 21, 2012) (7 pages) doi:10.1115/1.4007107 History: Received September 23, 2011; Revised June 19, 2012; Published August 21, 2012; Online August 21, 2012

Lubricant flow properties of polyalphaolefin (PAO) oil have been experimentally investigated based on a ball-on-disc configuration under micro oil supply condition. The oil pool shape and central film thickness in the contact region were obtained using fluorescence microscopy and optical interferometry, respectively. It has been found that the relative length between the inlet meniscus and Hertzian center point in the oil pool to Hertzian radius was much larger than 1 in a smaller lubricant supply of 20 μl, and the corresponding contact region initially entered the elastohydrodynamic lubrication (EHL) region and then became starved with the increasing speed. The variations of the relative film thickness as a function of starvation degree and the ratio of relative length to Hertzian radius were proposed to explain the obtained results. Besides, the fluorescence technique was used to directly observe the inlet meniscus position of the oil pool and helped to gain more understanding of the lubricant flow properties under micro oil supply condition.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 6

Variation of the relative length from the inlet meniscus to the Hertzian point with speed

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Figure 12

Variation of the relative film thickness with the ratio of the relative length to the Hertzian radius

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Figure 7

Interferometric images at three supplies and different speeds

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Figure 8

Variation of the thickness film with speed at three supplies

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Figure 9

Schematic diagram of the lubricant covered on the disc surface

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Figure 10

Film thickness in the fully flooded regime varied with speeds

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Figure 11

Variation of the relative film thickness with starvation degree

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Figure 1

Schematic diagram of a ball-on-disc configuration at pure rolling

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Figure 2

Variation of the oil pool at three supplies and different speeds

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Figure 3

Schematic diagram of the oil pool with several parameters

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Figure 4

Variation of the central width and tail width of the oil shape with speed

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Figure 5

Variation of the inner and outer length of the oil shape with speed

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