Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
권호 표지

Evaporation Cooling of Droplet due to Surface Roughness under Radiative Heat Input Condition

복사가열조건에서 표면 거칠기에 따른 액적의 증발 냉각

  • Published : 2004.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

The objective of the present work is to examine evaporation cooling of droplet due to surface roughness under radiative heat input condition. The surface temperatures varied from $80\~160^{\circ}C$ on aluminum alloy (AL 2024) and surface roughness was $0.18{\mu}m,\;1.36{\mu}m$. The results are as follows; Regardless of surface roughness under radiative heat input condition, as droplet diameter is larger, the in-depth temperature of solid decreases and evaporation time increases. In the case of $0.18{\mu}m\;and\;1.36{\mu}m$ of surface roughness, the larger the surface roughness is, the less the evaporation time is and the larger the temperature within the solid is. In the case of $Ra=0.18{\mu}m$ evaporation time and time averaged heat flux for radiative heat input case is shorter than for the conductive case.

Keywords

References

  1. Toda, S, 'A Study of Mist cooling 1st Report: Investigation of Mist Cooling', Heat Transfer Jap. Res., col. 1, pp. 39-50, 1972
  2. Bonacina, C., DelGiudice, S., Comini, G., 'Dropwise Evaporation', J. of Heat Transfer, Vol. 101, pp. 441-446, 1979 https://doi.org/10.1115/1.3451004
  3. Rizza, J.,'A Numerical Solution to Dropwise Evaporation', J of Heat Transfer, Vol. 103, pp. 501-507, 1981 https://doi.org/10.1115/1.3244492
  4. Seki, M, Kawamura, H., Sanokawa, K, 'Transient Temperature Profile of a Hot Wall due to an Impinging Liquid Droplet', J. of Heat Transfer, Vol. 100, pp. 167-169, 1978 https://doi.org/10.1115/1.3450494
  5. Michiyoshi, I., Makino, K,'Heat Transfer Characteristics of Evaporation of a Liquid Droplet on the Heated Surfaces', Int. J. of Heat Mass Transfer, Vol. 21, pp. 605-613, 1978 https://doi.org/10.1016/0017-9310(78)90057-1
  6. Makino, K., Michiyoshi, I., 'Discussions of Transient Heat Transfer to a Water Droplet on Heated Surfaces under Atmospheric Pressure', Int. J. of Heat Mass Transfer, Vol. 30, No.9, pp. 1895-1905, 1989 https://doi.org/10.1016/0017-9310(87)90249-3
  7. DiMarzo, M, Evans, D. D., 'Evaporation of a Water Droplet Deposited on a Hot High Thennal Conductivity Surface', J. of Heat Transfer, Vol. 111, pp. 210-213, 1989 https://doi.org/10.1115/1.3250652
  8. Abu-Zaid, M, Atreya, A, 'Transient Cooling of Hot Porous and Nonporous Ceramic Solids by Droplet Evaporation', J. of Heat Transfer, Vol. 116, pp. 694-701, 1994 https://doi.org/10.1115/1.2910924
  9. 방창훈, 양창호,' 액적의 Weber 수에 따른 냉각특성의 변화', 산업안전학회지, 제18권, 제1호, pp. 33-37, 2002
  10. 방창훈, 권진순, '표면거칠기에 의한 액적의 증발냉각,' 산업안전학회지, 제18권, 제3호, pp.29-33, 2003
  11. Cengel Y. A., Boles M .A., Thermodynamics, McGraw-Hill, Int. ed, 1994
  12. John R .Thome, Enhanced Boiling Heat Transfer, Hemisphere publishing Co.. 1990