Abstract
This paper discusses the design of structured surface to enable quick removal of the liquid on it. Conventional measurement of contact angle and/or sliding angle does not necessarily give actual evaluation because of the liquid volume is limited to several iiL. In this paper, water or oil of 3mL was poured over the structured surface that made of polydimethylsiloxane and the total area of residual droplets was calculated from the captured image with camera. The pattern was line-and-space with rectangular cross-section of which dimension was sub-millimeter order. The pattern was oriented in parallel or perpendicular to the flow. V-arrangement converging to the flow direction was also tried. It was found that V-arrangement was effective both for water and oil. The appropriate dimension was 100mm in depth, width and height.
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