凝縮形態へ及ぼす金属薄膜面と微細加工面の影響に関する実験的検討

抄録

Dropwise condensation (DWC) has high heat transfer coefficient. However, it is difficult to maintain DWC for a long time. It is important to understand the effect of the surface condition. In the present paper, the wettability of the metal-sputtered surfaces were controlled by MEMS technology. The effect of several metal-sputtered surfaces, i.e., 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 Titanium (Ti) and Chromium (Cr) films were FWC. For DWC, the surface adsorption force was lower than that of FWC. These results can be explained by Young's equation.