ICONE23-1707 EFFECT OF MICROFABRICATED SURFACE BY MEMS TECHNOLOGY ON CONDENSATION HEAT TRANSFER

Abstract

The present study was intended to examine how the condensation heat transfer, especially the drop-wise condensation, was affected by modifying the surface nature. In the present study, condensation heat transfer experiments for steam were performed by using mirror-finished copper surface with very thin metal films by using sputtering. That is, the effects on pattern of condensation heat transfer, i.e., drop-wise condensation(DWC) or film-wise condensation(FWC), of metal-sputtered surfaces were examined experimentally and qualitatively. DWC has ten times higher heat transfer coefficient than FWC. The surface condensation with sputtered thin Pb, Cr, Ag films became DWC. On the other hand, the surface condensation with sputtered thin Ti and Cu films was FWC. In the case of DWC, it has high contact angle compared to FWC.