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1 2009

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Determination of wetting at elevated temperatures using image analysis

Kocaefe D., Ergin G., Villeneuve V., Kocaefe Y.

Archives of Computational Materials Science and Surface Engineering

2009

Vol. 1, nr 4

213-224

Purpose: Wettability of a solid by a liquid is characterized by the contact angle or the wettability parameter which is a function of the contact angle and the surface tension. One well-known method to determine the contact angle and the surface tension experimentally is the sessile-drop method. The accuracy of this method depends on different geometric parameters measured from the image of the liquid drop on the solid captured during the experiments. In this study, software was developed to measure the parameters required for the calculation of the contact angle and the surface tension as well as all other relevant parameters such as spreading and drop volume from the sessile-drop images. Design/methodology/approach: The image analysis program presented in this study was developed to determine the wetting characteristics of a solid/molten metal system at elevated temperatures; hence, it deals mainly with the measurement of the contact angle and the calculation of the surface tension from the images captured during such experiments. Findings: In this study, a robust image analysis program has been developed. It gives not only the contact angle and the surface tension, but also a number of other important parameters of interest in wetting such as the spreading and the change in the surface area and volume of the sessile drop under different lighting conditions. Practical implications: The future work will cover the development of new filters which will eliminate further the interference of components placed outside the "analysis window" with the components to be analyzed. This task will have an impact at the level of filtration in the operation pipeline presented above. Originality/value: The results are validated by comparing them with the measurements conducted using an optical microscope; and the agreement is good.