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A series of sprinkler discharging tests was conducted to measure the droplet size and its distribution of residential fire sprinkler heads. Droplet sizes in sprinkler spray were measured using a laser diffraction method for the flush, circular and pendent type sprinkler head. In this study, the Dv,50 of the flush type sprinkler heads were ranged between 530~1040 μm and those of circular and pendent type were 988 μm and 916 μm, respectively. The measured cumulative volume distributions were followed by a combination of the log-normal and Rosin-Rammler distribution which is widely used in the computational fire analysis and the parameters of distribution function were obtained from the best fit line through the measured data.

An Experimental Study on the Droplet Size Distribution of Sprinkler Spray for Residential Building