Abstract
Dropwise condensation (DWC) has high heat transfer coefficient. However, It is difficult to maintain DWC for long time. In order to maintain DWC long enough, it is important to understand the effect of the surface condition. In the present paper, the wettability of the metal-sputtered surfaces was controlled by MEMS technology. The effect of several metal-sputtered surfaces, i.e., Cupper(Cu), Titanium(Ti), Silver(Ag), Chromium(Cr), and Lead(Pb) on the pattern of the condensation, i.e., DWC or FWC, was examined qualitatively. The surface condensation with sputtered thin Silver(Ag) and Lead(Pb) films were DWC. On the other hand, the surface condensation with sputtered thin Cupper(Cu), Titanium(Ti) and Chromium(Cr) films were FWC. For DWC, the surface adsorption force was lower than that of FWC.
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