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http://dx.doi.org/10.7736/KSPE.2013.30.12.1335

The Behavioral Characteristics of a Droplet on the Line Patterned Surface Including Water Film  

Lee, Changwoo (Department of Mechanical Engineering, Pohang Univ. of Science and Technology)
Park, Jinyoung (Department of Mechanical Engineering, Pohang Univ. of Science and Technology)
Cho, Handong (Department of Mechanical Engineering, Pohang Univ. of Science and Technology)
Hwang, Woonbong (Department of Mechanical Engineering, Pohang Univ. of Science and Technology)
Publication Information
Journal of the Korean Society for Precision Engineering / v.30, no.12, 2013 , pp. 1335-1340 More about this Journal
Abstract
Herein the water film was introduced to the hydrophilic area on the line patterned surface to solve the contradiction caused by surface roughness (high different wettability has advantage to control the droplet but high roughness for that high wettability difference causes obstruction of droplet moving). Thus the droplet on the water film could not be hindered to line direction but restricted to orthogonal direction, effectively. In addition, droplet behaviors according to droplet volume and line thickness were studied. Droplet fell off the line with narrowing the interface between the droplet and the water film on the line. When the droplet fell off the line, the plate angle was designated as a critical plate angle and it used as an indicator of surface capability to control the droplet. As a result critical plate angle increases as droplet volume decreases and line thickness increases.
Keywords
Line patterned surface; Wettability Patterning; Water film;
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