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Published on: April 7, 2017
Interferometric Imaging of Solvent Vapor of Evaporating Liquid Films
Felix Braig1, Florian Narrog1, Hans M Sauer1
1Department of Mechanical and Process Engineering, Institute of Printing Science and Technology, Technical University of Darmstadt, Magdalenenstrasse 2, 64289 Darmstadt, Hesse, Germany.
Abstract:
The liquid deposition of thin films requires a thorough understanding of the underlying drying process, as it is an essential subprocess, where many defects may arise. To complement experimental studies, the present study uses a laser Michelson interferometer to visualize the vapor cloud of evaporating liquid films. The recorded interferometric patterns are evaluated using windowed Fourier filtering and a novel phase-unwrapping algorithm to allow for a robust analysis. Thin solvent stripes of different lengths are combined to yield a quantitative two-dimensional distribution of the solvent vapor concentration along a thin liquid stripe. The results show a considerable influence of natural convection during evaporation.
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