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Effects of Surface Roughness on Evaporation Cooling of Single Water Droplet in Radiative Fields  

유갑종 (경북대학교 기계공학부)
박철우 (경북대학교 기계공학)
장충선 (경북대학교 대학원 기계공학과)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.16, no.5, 2004 , pp. 467-474 More about this Journal
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$^{\circ}C$.>.>.
Keywords
Radiant heat; Water droplet; Surface roughness; Evaporation time; Fire extinguishing; Heat flux;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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