Temperature Gradients Through EHD Films and Molecular Alignment Evidenced By Infrared Spectroscopy

[+] Author and Article Information
V. W. King, J. L. Lauer

Department of Mechanical Engineering, Aeronautical Engineering & Mechanics, Rensselaer Polytechnic Institute, Troy, N. Y. 12181

J. of Lubrication Tech 103(1), 65-73 (Jan 01, 1981) (9 pages) doi:10.1115/1.3251615 History: Received February 21, 1980; Online November 17, 2009


Partial and complete emission band reversals have been observed in the infrared emission spectra from portions of operating sliding contacts. An elementary analysis has been carried out to show that partial reversals are due to temperature gradients in the fluid film—the film acts both as a radiation-emitter and absorber, and that total reversals—an emission spectrum appears as an absorption spectrum—are likely to be due to a continuum source, such as hot solid asperities. The total energy radiated under the latter conditions exceeds that under the others. A decrease in gap width with increased load was accompanied by a dramatic spectral change in the case of 5P4E polyphenyl ether, which is indicative of molecular alignment.

Copyright © 1981 by ASME
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