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Visualization of coating flows

Published online by Cambridge University Press:  21 April 2006

Peter M. Schweizer
Peter M. Schweizer
Affiliation:
IIford AG, Industriestrasse 15, CH-1701 Fribourg, Switzerland
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Abstract

An experimental technique for visualizing small-scale film flows is presented. The method utilizes hydrogen bubbles, dye injection, and optical sectioning. Specific aspects of applying this technique to coating processes, distinguished by two free surfaces, liquid-liquid interfaces, static and dynamic wetting lines, and small characteristic dimensions, are discussed in detail. This experimental approach is essential in providing the necessary boundary conditions for modern computer-aided theoretical computations of wetting-related flow fields. The power of the visualization method is demonstrated by examples showing the flow pattern of two liquid films merging on an inclined plane and the flow field of a liquid film being transferred from an inclined plane onto a moving surface.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 193 , August 1988 , pp. 285 - 302
Copyright
© 1988 Cambridge University Press

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