Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Study on the Influence of Boiling Heat Transfer of Nanofluid with Particle Length and Mixing Ratio of Carbon Nanotube

탄소나노튜브 입자의 길이와 혼합비율이 나노유체의 비등 열전달에 미치는 영향에 대한 연구

  • Park, Sung-Seek (Department of Nuclear and Energy Engineering, Jeju National University) ;
  • Kim, Woo Joong (Department of Nuclear and Energy Engineering, Jeju National University) ;
  • Kim, Jong Yoon (Department of Fire Safety Management, Seojeong College) ;
  • Jeon, Yong-Han (Department of Protection and Safety, Sang Ji Young seo College) ;
  • Kim, Nam-Jin (Department of Nuclear and Energy Engineering, Jeju National University)
  • 박성식 (제주대학교 에너지공학과) ;
  • 김우중 (제주대학교 에너지공학과) ;
  • 김종윤 (서정대학교 소방안전관리과) ;
  • 전용한 (상지영서대학교 소방안전과) ;
  • 김남진 (제주대학교 에너지공학과)
  • Received : 2014.08.08
  • Accepted : 2014.10.06
  • Published : 2015.01.10
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Abstract

A boiling heat transfer system is used in a variety of industrial processes and applications, such as refrigeration, power generation, heat exchangers, cooling of high-power electronics components, and cooling of nuclear reactors. The critical heat flux (CHF) is the thermal limit during a boiling heat transfer phase change; at the CHF point, the heat transfer is maximized, followed by a drastic degradation beyond the CHF point. Therefore, Enhancement of CHF is essential for economy and safety of heat transfer system. In this study, the CHF and heat transfer coefficient under the pool-boiling state were tested using multi-wall carbon nanotubes (MWCNTs) CM-95 and CM-100. These two types of multi-wall carbon nanotubes have different sizes but the same thermal conductivity. The results showed that the highest CHF increased for both MWCNTs CM-95 and CM-100 at the volume fraction of 0.001%, and that the CHF-increase ratio for MWCNT CM-100 nanofluid with long particles was higher than that for MWCNT CM-95 nanofluid with short particles. Also, at the volume fraction of 0.001%, the MWCNT CM-100 nanofluid indicated a 5.5% higher CHF-increase ratio as well as an approximately 23.87% higher heat-transfer coefficient increase ratio compared with the MWCNT CM-95 nanofluid.

Keywords

References

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