Journal
APPLIED THERMAL ENGINEERING
Volume 56, Issue 1-2, Pages 112-119Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2013.03.046
Keywords
Carbon nanotubes; Copper matrix composites; Cold spray process; Mechanical alloying; Nucleate boiling heat transfer
Funding
- National Research Foundation of Korea
- Korean Government [2012015020]
- Energy Efficiency & Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Knowledge Economy of Korea [20122010100120]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20122010100120] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, the application of mechanical alloying and cold spray process on the fabrication of carbon nanotube-copper (CNT-Cu) composite surface coatings for boiling heat transfer was investigated. Three types of coatings (5, 10, and 15 vol.% CNT) were fabricated. Boiling heat transfer of CNT-Cu composite coatings was investigated under a pool of saturated R134a at 4.8 +/- 0.04 degrees C. Results showed that nucleate boiling can be enhanced by CNT-Cu composite powder coatings fabricated by cold spray. Incipience superheat of the coatings (5-6 K) was considerably lower than that of the plain Cu plate (8 K). At heat fluxes >20 kW/m(2), significant differences in the enhancement ratios were observed. The maximum heat transfer coefficient enhancement achieved by the coatings was 1.21-1.74 times that of the plain Cu plate. The one-layer coating with 15 vol.% CNT exhibited the best boiling heat transfer performance in terms of lowering the superheat and enhancing the heat transfer coefficient. (c) 2013 Elsevier Ltd. All rights reserved.
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