Figure - available from: Journal of Materials Science
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A variety of surfaces with different wettability are prepared by coating aluminum sheets in this paper. The dynamic behavior of drops crossing the boundary between two surfaces with different wettability is recorded by a high-speed camera. When a drop is placed at the boundary between two different wettability surfaces, the drop can move from the s...
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Citations
Straight and curved hydrophilic microfinned surfaces are prepared in this work by photolithography and sputtering coating techniques using silicon wafers as substrates. The behavior characteristics of drops on these surfaces are discussed by using image processing technology. Experimental results show that when a drop is placed on the straight microfinned surface, the front contact line of the drop can move, while the rear contact line remains fixed. On the curved microfinned surface, however, both the front and the rear contact line can move. The drop can be self-propelled directionally from the region with larger roughness to the region with smaller roughness. The characteristics of velocity and acceleration on both surfaces are analyzed. A theoretical model is proposed by analyzing the energy conversion and compared with the experimental results. This study provides a novel microstructured surface for enhancing the heat transfer performance of condensers.
