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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Effects of Surface Roughness on Evaporation Cooling of Single Water Droplet in Radiative Fields

복사장 내에서 충돌면의 표면조도가 단일액적 증발냉각에 미치는 영향

  • 유갑종 (경북대학교 기계공학부) ;
  • 박철우 (경북대학교 기계공학) ;
  • 장충선 (경북대학교 대학원 기계공학과)
  • Published : 2004.05.01
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Abstract

This paper presents the results of an experimental investigation for the effect of radiant heat on the evaporation cooling of water droplet in the process of fire extinguishing. The experiments are mainly focused on the surface temperature, the surface roughness and the droplet diameter. The range of surface temperature is T$_{s}$ =80－14$0^{\circ}C$, surface roughness is R$_{a}$=0.08－0.64 ${\mu}{\textrm}{m}$ and the droplet diameter is $\Phi$=3.0 mm in the radiation. The results show that the evaporation time is shorter for the larger surface roughness and the volume of droplet increased when the surface roughness is 0.64 ${\mu}{\textrm}{m}$ at the surface temperature 127$^{\circ}C$. When the surface roughness is 0.64 ${\mu}{\textrm}{m}$, the heat flux is larger than the surface roughness is 0.08 ${\mu}{\textrm}{m}$ at the surface temperature 81$^{\circ}C$.>.>.

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References

  1. Technique of Fire Extinguishing Korea Institute of Fire and Safety
  2. Korean Journal of Air-Conditioning and Refrigerating Engineers of Korea v.15 no.7 A study on the performance of water mist spray fire protection system Kim,B.H.;Kim,Y.P.;Moon,C.J.;Hong,C.H.;Yi,H.W.;Choi,H.H.
  3. Korean Journal of Air-Conditioning and Refrigerating Engineers of Korea v.13 no.9 Evaporation cooling phenomena of droplets containing fire suppression agents Riu,K.J.;Bang,C.H.;Kim,H.W.
  4. Korean Journal of Air-Conditioning and Refrigerating Engineers of Korea v.15 no.4 A study on the fire suppression characteristics using a water mist Kim,S.C.;Ryou,H.S.
  5. Int. J. Heat Mass Transfer v.9 The leidenfrost phenomenon:Film boiling of liquid droplets on a flat plate Gottfried,B.S.;Lee,C.J.;Bell,K.J. https://doi.org/10.1016/0017-9310(66)90112-8
  6. J. Heat Transfer v.101 Dropwise evaporation Bonacina,C.;DelGiudice,S.;Comini,G. https://doi.org/10.1115/1.3451004
  7. J. Heat Transfer v.103 A numerical solution to dropwise evaporation Rizza,J.J. https://doi.org/10.1115/1.3244492
  8. J. Heat Transfer v.111 Evaporation of a water droplet deposited on a hot high thermal conductivity surface DiMarzo,M.;Evans,D.D. https://doi.org/10.1115/1.3250652
  9. J. Heat Transfer v.116 Transsient cooling of hot porous and nonporous ceramic solids by droplet evaporation Abu-Zaid,M.;Atreya,A. https://doi.org/10.1115/1.2910924
  10. Technique of Fire Protection no.25 The study on the fire of radiation heat transfer Kim,C.I.
  11. Experimental Heat Transfer v.6 Dropwise evaporative cooling in radiative field Tartarini,P.;DiMarzo,M.
  12. NIST-GCR Multidroplet evaporation cooling Dawson,H.F.;DiMarzo,M.
  13. Heat and Mass Transfer v.38 Droplet evaporation on porous and non-porous ceramic solids heated from top Abu-Zaid,M. https://doi.org/10.1007/s00231-001-0281-8
  14. Mechanical Engineering Describing uncertainties in single sample experiments Kline,S.;McClintok,F.A.
  15. J. Fluids Engineering v.107 Using uncertainty analysis in the planning of an experiment Moffat,R.J. https://doi.org/10.1115/1.3242452
  16. Experimental Thermal ans Fluid Science v.1 Describing the uncertainties in experimental results Moffat,R.J. https://doi.org/10.1016/0894-1777(88)90043-X
  17. Two-phase flow heat transfer Lee,S.Y.;Kim,B.G.;Kim,M.