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The Measurement of Wetting Angle by Applying an ADSA Model of Sessile Drop on Selected Textile Surfaces

Research and development

Authors:

• Gocławski Jarosław
  Computer Engineering Department, Technical University of Łódź, Łódź, Poland
• Urbaniak–Domagała Wiesława
  Department of Physics and Metrology of Textiles, Technical University of Łódź, Łódź, Poland

Full text

Abstract: This paper presents a method of liquid-solid contact (wetting) angle measurement for selected textile surfaces, assuming the angles to be less than 90°. The method uses a special apparatus for acquisition of sessile drop images. Specialised image processing methods involving edge filtering, image morphology and a prior knowledge of the drop boundary location are used to extract droplet edges and the bottom line of a solid textile surface. Then ADSA profile optimisation is applied to find the liquid contact angle with respect to the bottom line. The ADSA trajectory is fitted to the drop edge data using a trust – region, nonlinear optimisation algorithm, with a proposed definition of distance error measurement. The image processing and analysis methods mentioned above are implemented in a MATLAB 7.0 environment; the results of individual measurements are shown in MATLAB windows as well.

Tags: ADSA model, sessile drop, wetting angle, contact angle, capillary constant, edge detection, dilation.

Published in issue no 2 (67) / 2008, pages 84–88.