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TECHNICAL PAPERS

Mechanics of a Porous Web Moving Over a Cylindrical Guide

[+] Author and Article Information
Sinan Müftü

Haystack Observatory, Massachusetts Institute of Technology, Westford, MA 01886

M. Cengiz Altan

School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, OK 73019

J. Tribol 122(2), 418-426 (Jul 06, 1999) (9 pages) doi:10.1115/1.555378 History: Received March 17, 1999; Revised July 06, 1999
Copyright © 2000 by ASME
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References

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Figures

Grahic Jump Location
Schematic view of a porous web moving over a stationary guide
Grahic Jump Location
Schematic view of the reference state of the web showing the contact and no-contact regions. (a) Web-guide spacing in no-contact region. (b) Quiescent web in contact region.
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The porosity parameter A and the normalized permeability κ1/2/c as a function of fiber volume fraction ϕ in a web. The different curves for different σo/L are calculated while all the problem parameters are kept constant as given in Table 1.
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The steady-state equilibrium conditions in the web-guide interface. Note that the web is in contact near the exit side of the interface (ϕ=0.88,σo/L=5×10−6,p̄o=1).
Grahic Jump Location
The web-guide clearance h̄, air pressure p̄, and contact pressure p̄c variation for different values of fiber volume fraction ϕ values are given in plots (a–c) for σo/L=5×10−6,p̄o=1. Plot (d) gives the detail of the entry region for ϕ=0.73.
Grahic Jump Location
The effect of nondimensional asperity height on the tension drop ΔN/T as a function of fiber volume fraction ϕ, for p̄o=1
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The effect of asperity engagement height and compliance on the tension drop ΔN/T as a function of the porosity parameter A
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Schematic view of a web transported over a guide with speed Vx and under tension T

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