Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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A Study on the Behavior of Nano-fluid Droplet Impacting Upon a Hot Surface

고온벽과 충돌하는 나노유체 액적 거동에 관한 연구

  • 김으뜸 (전남대학교 기계공학부) ;
  • 박인한 (전남대학교 기계공학부) ;
  • 배녹호 (전남대학교 기계공학부) ;
  • 강보선 (전남대학교 기계공학부)
  • Received : 2015.01.26
  • Accepted : 2015.03.17
  • Published : 2015.03.31
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Abstract

In this study, the behavior of water or nanofluid droplets impacting upon a hot surface was investigated by visualization of impacting phenomena with time-delayed photographic technique. Changing the mass ratio of nanofluid and the temperature of the heated surface, the characteristics of the spreading behavior and the diameter of spreading liquid film was compared between water and nanofluid droplets. The impacting droplet spreaded as a liquid film after impact and nanofluid droplets spreaded more widely than water droplets. After reaching the maximum diameter, water droplets shrinked more than nanofluid droplets. Based on this, the heat transfer area from a hot surface to impacting nanofluid droplets would be wider than that of impacting water droplets. Considering individual impacting droplet only, spray cooling using nanofluid would be better than using water.

Keywords

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Cited by

  1. Dynamic wetting and heat transfer characteristics of a liquid droplet impinging on heated textured surfaces vol.97, 2016, https://doi.org/10.1016/j.ijheatmasstransfer.2016.02.041