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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Surface Tension-Driven Flows within Drying Paint Films

Get access (open in a dialog) DOI: 10.1615/IHTC15.mtr.008582
pages 5091-5100

摘要

Paint films with thicknesses ranging from 150 to 1000mm were aplied on stainless steel substrates using a paint applicator with a knife edge that created a layer of uniform thickness. A model paint was developed for the experiments with known solvent and resin compositions and the samples were cured in a natural convection oven at temperatures varying from 100-200 °C. Paint weight loss during curing was measured and photographs of the paint surface were taken during curing. An analytical solution of the mass-diffusion equation was used to model solvent evaporation from the paint film surface and to calculate the mass diffusivity of the solvent. The model allowed calculation of the concentration gradient and therefore surface tension variations in the paint films. Photographs of the surface of drying paint films showed the formation of self-organizing convective cells driven by surface tension gradient. These cells can lead to variations in the paint film thickness and consequently create defects in the paint finish.