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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Dropwise condensation heat transfer on ion implanted metallic surfaces

Alfred Leipertz
Lehrstuhl fur Technische Thermodynamik (LTT), Universitat Erlangen-Nurnberg,Am Weichselgarten 8, D-91058 Erlangen, Germany; ESYTEC Energie- und Systemtechnik GmbH Erlangen, Am Weichselgarten 6, D-91058 Erlangen, Germany

Kyong-Hee Choi
Lehrstuhl fur Technische Thermodynamik (LTT), Universitat Erlangen-Nurnberg,Am Weichselgarten 8, D-91058 Erlangen, Germany; ESYTEC Energie- und Systemtechnik GmbH Erlangen, Am Weichselgarten 6, D-91058 Erlangen, Germany

Liv Diezel
ESYTEC Energie- und Systemtechnik GmbH Erlangen, Am Weichselgarten 6, D-91058 Erlangen, Germany

DOI: 10.1615/IHTC12.590
6 pages

Sinopsis

Dropwise condensation can be achieved on the surfaces of several different metallic materials (Copper, Titanium, Aluminum, High-grade Steel and Hastelloy) which have been treated by ion implantation with nitrogen, oxygen or carbon ions. Stable dropwise condensation has been found for a long-time continuous testing phase over more than four years for some of the materials tested. Heat transfer measurements have been performed for the condensation of pure quiescent steam near atmospheric pressure. The measured heat transfer coefficients were up to more than 17-times larger than that ones of filmwise condensation, its values being dependent on the amount of ions implanted. The measured heat flux increases with increasing surface subcooling approaching a maximum which is dependent on the surface material used. Further subcooling results in a decrease of the heat flux. An ion diffusion process along the surface allows a locally restricted ion implantation which is a strong simplification in the production of appropriate surfaces.

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