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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Analysis of Parameters that Influence in Determining the Contact Angle Through Image Processing
Submission Author:
Henrique Stacheski Schleetz , SP
Co-Authors:
Henrique Stacheski Schleetz, Fabio Suguimoto, Marcos Lourenço
Presenter: Henrique Stacheski Schleetz
doi://10.26678/ABCM.ENCIT2020.CIT20-0542
Abstract
Wettability represents a significant parameter in the engineering. Therefore, the development of tools to measure is relevant. Several experimental arrangements can be used, highlighting the sessile drop scheme due to its simplicity. The scheme consists of placing a static drop on a solid surface. Subsequently, photographs are taken, which will be processed to determine the contact angle. The present work aims to evaluate the parameters that influence the measurement of the contact angle through image processing. Therefore, an algorithm for determining contact angles was developed through the software MATLAB® and a series of analyzes was made. Profiles of the experimental drop scheme were artificially created. Through the variation of parameters, such as the value of the contact angles, the curve fit used and the drop shape, it was possible to determine the influence of each variable on the measurement process and on the results. For the spherical drops, the θ/2 method presented an error close to zero for the entire range of contact angles analyzed, while the fitting methods, only for a reduced range. As the flatness of the drop profile increases, an increase in the error also was noted, both for the θ/2 method and for the fitting methods.
Keywords
Wettability, contact angle, Algorithm, Two-phase Flow, Heat transfer
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