Surface Ribbing of a Thin Viscous Fluid Film Emerging From a Spreader or Roller

[+] Author and Article Information
C. Fall

School of Mathematics, University of Leeds, Leeds, England

J. of Lubrication Tech 100(4), 462-466 (Oct 01, 1978) (5 pages) doi:10.1115/1.3453251 History: Received March 10, 1978; Revised June 15, 1978; Online October 20, 2010


The thin film produced by the flow of a viscous fluid through a narrow gap between a spreader (or roller) and a flat plate is often subject to surface ribbing. A linear perturbation analysis, based upon lubrication theory, is used to examine the nature of this ribbed film and, specifically, to explain the large distances over which ribbing is observed to prevail. Taking into account the effects of both surface tension and gravity in smoothing out the film, the analysis predicts a characteristic distance from striated film-rupture to where a uniform film is formed.

Copyright © 1978 by ASME
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