Related Experiment Video
Updated: Jun 13, 2026

Glass-Based Devices to Generate Drops and Emulsions
Published on: April 5, 2022
Communications: Wall free capillarity and pendant drop removal
Siang-Jie Hong1, Feng-Ming Chang, Seong Heng Chan
1Department of Chemical and Materials Engineering, National Central University, Jhongli, Taiwan 320, Republic of China.
Abstract:
When a sessile drop encounters a pendant drop through a hole, it is generally anticipated that they will coalesce and flow downward due to gravity. However, like "wall-free" capillarity, we show that the pendant drop may be sucked up by a sliding drop instantaneously if the radius of the curvature of the former is smaller than that of the later. This phenomenon can be explained by Laplace-Young equation and convective Ostwald ripening. Our results indicate that superhydrophilic perforated surface can be used as an effective way for the removal of small droplets adhering to the inner walls of microchannel systems.
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