Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Evaluation of Dispersion Stability and Absorption Performance Enhancement of Binary Nanoemulsion Fluids

이성분 나노에멀전 유체의 분산안정성 및 흡수성능 촉진실험

  • Lee, Jin-Ki (Energy System R&D Group, Korea Institute of Industrial Technology) ;
  • Kim, Young-Jin (Department of Mechanical Engineering, Kyunghee University) ;
  • Shin, Myung-Chul (Energy System R&D Group, Korea Institute of Industrial Technology) ;
  • Kim, Se-Won (Energy System R&D Group, Korea Institute of Industrial Technology) ;
  • Kang, Yong-Tae (Department of Mechanical Engineering, Kyunghee University)
  • 이진기 (한국생산기술연구원 에너지시스템연구그룹) ;
  • 김영진 (경희대학교 기계공학과) ;
  • 신명철 (한국생산기술연구원 에너지시스템연구그룹) ;
  • 김세원 (한국생산기술연구원 에너지시스템연구그룹) ;
  • 강용태 (경희대학교 기계공학과)
  • Received : 2011.12.21
  • Accepted : 2012.06.21
  • Published : 2012.09.01
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Abstract

This paper aims to examine the effect of nanodroplets on pool-type absorption heat transfer enhancement and to find the relationship between the dispersion stability and the absorption performance. The concentrations of oil and surfactant are considered as the key parameters. $C_{12}E_4$ and Tween20 are used as the surfactants and N-decane oil is added to the $NH_3/H_2O$ solution to make the binary nanoemulsion fluids. Binary nanoemulsion fluids are dispersed by the ultrasonic vibrator and the stirrer under specific conditions. The dispersion stability of binary nanoemulsion fluids for each oil concentrations is evaluated from the droplet size and Tyndall effect analysis. The absorption performance of binary nanoemulsion fluids is compared with the result of dispersion stability. In addition, it is found that the binary nanoemulsion fluid is a strong candidate as a new working fluid for absorption applications.

본 논문에서는 암모니아/물 흡수식 시스템의 흡수성능 촉진에 대한 나노액적의 영향을 파악하고 흡수성능과 분산안정성의 상관관계를 규명함으로써 흡수식 시스템에 대한 이성분 나노에멀전유체의 적용가능성을 제시하고자 한다. 이성분 나노에멀전 유체는 암모니아/물 용액을 모유체로 하며, N-decane 오일을 모유체에 분산시키기 위하여 $C_{12}E_4$와 Tween20을 첨가제로 사용하였다. 이성분 나노에멀전유체의 안정적인 분산을 위하여 교반과정과 초음파 처리과정을 거쳤으며, 이렇게 분산된 유체는 입도측정과 틴들현상 분석을 통해 분산안정성 평가를 수행하였다. 그 결과, 이성분 나노에멀전 유체의 흡수성능 및 열전달 성능에 대한 분산안정성의 영향 및 흡수식 시스템으로의 적용가능성을 확인하였다.

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References

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