期刊
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
卷 212, 期 8, 页码 1756-1766出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201431858
关键词
copper oxide; critical heat flux; graphene oxide; nanofluid; nichrome wire
资金
- Human Resource Training Project for Regional Innovation - Ministry of Education, Science Technology (MEST)
- National Research Foundation (NRF) of Korea [2012H1B8A2026133]
- Development of liquid nitrogen based cryogenic machining technology and system for titanium and CGI machining - Ministry of Trade, Industry AMP
- Energy (MOTIE) of Korea
- National Research Foundation of Korea [2012H1B8A2026133] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Copper oxide nanoparticles nanofluids (CuO-NPs-NF) are promising candidates for pool boiling critical heat flux (CHF) applications due to their multifaceted advantages like easy tunability, eco-friendliness, cost-effectiveness, easy chemical modification and higher thermal conductivities. In addition, entrapping the CuO-NPs in/on to graphene oxide (GO) improves the CHF values compared to CuO-NPs alone. This paper reports a high performance hybrid NFs based on CuO and GO nanocomposites (CuO:GO-NCs-NFs), exhibiting higher pool boiling CHF values even at very low concentrations. The proposed novel NFs have higher thermal conductivities compared with the DI water. The 0.06wt% CuO:GO-NCs-NF shows the highest CHF value, ca.160%, which is much higher than that of pure CuO-NPs-NF (99%). Atomic force microscope (AFM) and field-emission SEM (FE-SEM) micrographs of the wire after the pool boiling experiments revealed a rough surface having high wettability and lower contact angle (CA) with 47 degrees due to the formation of a layer-on-layer network on the wire surface. In addition, we have developed a method for in situ generation of core-shell template model CuO-NPs using Ostwald's ripening method in isopropanol-water system. Eventually, the CuO:GO-NCs-NF could show robust and high performance CHF pool boiling even at low concentrations that are required in realistic applications. Schematic illustration of pool boiling CHF values of CuO-NPs and CuO:GO-NCs on nichrome wire surface. (a) Built-up layer roughness average by atomic force microscope (AFM) and (b) FEM-SEM. (c) comparison of pool boiling CHF experiment.
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