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Research Papers: Elastohydrodynamic Lubrication

Experimental and Numerical Study of Air Entrainment Between Web and Spirally Grooved Roller

[+] Author and Article Information
Si Bui Quang Tran, Yong Hoon Yoo, Jin Hwan Ko, Jihoon Kim, Jae Woo Lee, Yung Hwan Byun

Department of Aerospace and Information Engineering, Konkuk University, 1 Hwayang-dong, Kwangjin-gu, Seoul 143-701, Korea

Doyoung Byun1

Department of Aerospace and Information Engineering, Konkuk University, 1 Hwayang-dong, Kwangjin-gu, Seoul 143-701, Koreadybyun@konkuk.ac.kr

Kee Hyun Shin

Department of Mechanical Design Engineering, Konkuk University, Seoul 143-701, Korea

1

Corresponding author.

J. Tribol 131(2), 021502 (Mar 04, 2009) (8 pages) doi:10.1115/1.3070582 History: Received August 31, 2007; Revised December 03, 2008; Published March 04, 2009

This paper presents numerical quasistatic simulation results of the air entrainment phenomenon between a web and a spirally grooved roller. The numerical results show that during one complete rotation of the spirally grooved roller, the traction coefficient between the web and the roller changes with time due to the changing shape of the groove in the contact region, and the average traction coefficient of the circumferentially grooved roller is higher than that of the spirally grooved roller. Using a laser sensor, web deflection is measured and compared with the numerical results at the inlet. Furthermore, a smoke wire experiment shows a clear view of the air entrainment phenomenon at the entrance, between the web and the roller.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Scheme of a web and roller configuration. (a) Rectangular cross section of grooves and (b) triangular cross section of grooves.

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Figure 2

Spirally grooved roller configuration

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Figure 3

Contact position between the web and the roller along the circumference of the roller

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Figure 4

Schematics of computational domain for contact positions of 0 deg, 22.5 deg, 45 deg, 67.5 deg, and 90 deg

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Figure 5

Numerical algorithm flowchart

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Figure 6

Schematic of the three-color roll printing machine

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Figure 7

Experimental setup for web deflection measurement

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Figure 8

Air entrainment between roller and web

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Figure 9

Effects of groove depth and groove pitch on traction coefficients

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Figure 10

Air pressure between web and roller at a contact position of 0 deg

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Figure 11

Web deflection at a contact position of 0 deg

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Figure 12

Asperity contact pressures for cases with contact positions of (a) 0 deg, (b) 22.5 deg, (c) 45 deg, (d) 67.5 deg, and (e) 90 deg

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Figure 13

Traction coefficients during one rotation cycle of the spirally grooved roller

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Figure 14

Effects of groove depth and shape on traction

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Figure 15

Effect of web thickness on traction

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Figure 16

Effect of web tension on traction

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Figure 17

Effect of web velocity on traction

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