Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 299, Issue 2, Pages 841-849Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2006.02.018
Keywords
liquid drops; critical size; incipient motion; retention; forces; contact angle hysteresis
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Retention forces and drop parameters are investigated for drops on the verge of sliding on vertical and inclined Surfaces. Using earlier observations of drop geometry, the retentive-force factor relating surface-tension forces to contact-angle hysteresis is reliably determined. The retention force for a drop is found to be insignificantly affected by the aspect ratio of its contour. The maximum size of a drop is predicted with good accuracy. based on the two-circle method for approximating shapes of drops. The Bond number of a critical drop is found to be constant for a given surface and liquid. A general relation is proposed between the characteristic advancing and receding contact angles. The relation is supported by a large set of contact-angle data. In the absence Of OR data, the relation allows estimating the receding contact angle and the critical drop size, using only the advancing angle. (c) 2006 Elsevier Inc. All rights reserved.
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