Abstract
The contact angles of liquid drops on inclined plane surfaces have been investigated at critical conditions of sliding. Drops of two liquids were tested on eight surfaces covering a wide range of advancing and receding contact angles. Contact angles and contact line dimensions were observed for various drop sizes and surface inclination angles. The contact-angle variation along the circumference of the drop was best fit by a third-degree polynomial of the azimuthal angle. The findings lead to the development of a general relation between the advancing contact angle, the receding contact angle, and the maximum Bond number for a liquid–surface combination. This relation is well supported by data from the literature. The new relation allows the characterization of a surface by its advancing contact angle for a given liquid, and prediction of the corresponding receding angle and maximum drop size.
Acknowledgement: The authors acknowledge the support of the Air Conditioning and Refrigeration Center of the University of Illinois at Urbana-Champaign.
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© 2004 Springer-Verlag
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ElSherbini, A.I., Jacobi, A.M. (2004). Critical contact angles for liquid drops on inclined surfaces. In: Surface and Colloid Science. Progress in Colloid and Polymer Science, vol 128. Springer, Berlin, Heidelberg. https://doi.org/10.1007/b97081
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DOI: https://doi.org/10.1007/b97081
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