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, mirror-finished copper surface and some mirror-finished copper surfaces with very thin metal films by using spattering. The copper surfaces with the thin metal films were created by the MEMS technology. The film-condensation and also the drop-wise condensation were observed on the copper surface. The film-wise condensation heat transfer coefficient was higher values than the Nusselt's equation. It was approximately of the drop-wise condensation heat flux. The condensation on the mirror-finished copper surface was the drop-wise condensation. The heat flux was approximately the drop-wise condensation heat flux on the copper surface. The condensation on copper surfaces with thin Copper(Cu), Chromium(Cr) and Lead(Pb) films were drop-wise condensation. The condensation on copper surfaces with thin Titanium(Ti) film was film-wise condensation.
