Experimental studies on CHF characteristics of nano-fluids at pool boiling
SCIE
SCOPUS
- Title
- Experimental studies on CHF characteristics of nano-fluids at pool boiling
- Authors
- Kim, HD; Kim, J; Kim, MH
- Date Issued
- 2007-07
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Abstract
- To investigate the CHF characteristics of nano-fluids, pool boiling experiments of nano-fluids with various concentrations of TiO2 or Al2O3 nanoparticles were carried out using a 0.2 mm diameter cylindrical Ni-Cr wire under atmospheric pressure. The results show that the CHFs of various nano-fluids are significantly enhanced over that of pure water. SEM observation subsequent to the CHF experiment revealed that a nanoparticle coating is generated on the wire surface during pool boiling of nano-fluids. The CHF of pure water was measured on a nanoparticle-coated wire which was produced during the pool boiling experiments of nano-fluids. The CHF of pure water on the nanoparticle-coated wire was similar to that of nano-fluids. This result clearly shows that the main reason for CHF enhancement of nano-fluids is the modification of the heating surface by the nanoparticle deposition. The nanoparticle-coated surface was characterized with various parameters closely related to pool boiling CHF: surface roughness, contact angle, and capillary wicking performance. Finally, CHF enhancement of nano-fluids is discussed using the parameters. (c) 2007 Elsevier Ltd. All rights reserved.
- Keywords
- capillary wicking; CHF; contact angle; nano-fluids; nanoparticle surface coating; surface roughness; CRITICAL HEAT-FLUX; SURFACE-ROUGHNESS; WATER; NANOFLUIDS; LIQUIDS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/23290
- DOI
- 10.1016/j.ijmultiphaseflow.2007.02.007
- ISSN
- 0301-9322
- Article Type
- Article
- Citation
- INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, vol. 33, no. 7, page. 691 - 706, 2007-07
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