期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 125, 期 -, 页码 983-993出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2018.04.102
关键词
Dropwise condensation; Filmwise condensation; Ion implantation; Aluminum nitride; Hydrolysis; Non-condensable gas
资金
- National Research Foundation of Korea (NRF) grant - Korean government (Ministry of Science and ICT) [NRF-2017M2B2A9072724]
- Korea Multi-Purpose Accelerator Complex (KOMAC) operation fund of KAERI
- National Research Foundation of Korea [2017M2B2A9072724] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Aluminum substrate specimens are irradiated with nitrogen ions at various ion dose and ion energy levels in order to realize dropwise condensation on the specimen surfaces. Dropwise steam condensation initially occurs on these specimens, but the condensation mode changes into filmwise condensation. When the condensation mode changes to filmwise condensation, the heat transfer coefficient is measured to be approximately 40% lower than that predicted using the Nusselt theory; in addition, the color of the surface changes from yellow-brown to silver-white. This surface color change is the result of the hydrolysis reaction between the condensate and the nitrogen ion-implanted aluminum surface. Non condensable gas is generated by the hydrolysis reaction, and this non-condensable gas diminishes the heat transfer coefficient. In addition, the material composition of the specimen's surface changes and causes the transition of the condensation mode. (C) 2018 Elsevier Ltd. All rights reserved.
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