| Summary: | Aluminum substrates are irradiated with chromium ions and the steam condensation heat transfer performance on these surfaces is examined. Filmwise condensation is induced on the surface of aluminum specimens irradiated with chromium ion dose of less than 1016 ions/cm2 while dropwise condensation occurs on the specimens irradiated with chromium ion dose of 5 × 1016 ions/cm2 in the range of ion energy from 70 to 100 keV. The heat transfer coefficient of the surfaces on which dropwise condensation occurs appeared to be approximately twice as much as the prediction by Nusselt’s film theory. In a durability test, dropwise condensation lasts over six months and the heat transfer coefficient is also maintained. Keywords: Dropwise condensation, Filmwise condensation, Chromium, Ion implantation, Durability
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