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Characterization of water mist sprays using a phase-doppler-particle-analyzer and an iso-kinetic sampling probe
To date, the fire protection industry still relies primarily on the tried-and-true but expensive full-scale fire testing approach to develop water mist fire protection systems, due to the lack of design guidelines in the industry based on engineering first principles. This makes the development of many potential applications economically prohibitive due to the high cost for constructing a full-scale testing mockup. A Phase-Doppler-Particle-Analyzer (PDPA) was used to screen candidate water mist nozzles for use in a scaling validation aimed to allow scaled-down testing of water mist systems. A custom-designed iso-kinetic sampling probe (DCSP) was developed to independently measure water mist fluxes at the same locations where PDPA measurements were made. Measurements were taken at two elevations in selected full-cone water mist sprays. The water drop size was found to increase with radial distance from the spray centerline, while the mean drop velocity and drop concentration decrease with radial distance. Gross drop size distributions of water mist sprays were derived from local drop size distributions and water fluxes measured in two spray cross sections. It was found that, for the water mist sprays investigated in this study, both Rosin-Rammler and lognormal distributions are required to correlate the entire drop size spectrum. In general, the agreement between the mist fluxes measured with the PDPA and iso-kinetic sampling was within 7 % near the spray centerline. The selected nozzles show appropriate intended scaling in terms of the drop size, nozzle discharge pressure, and water discharge rate.
Characterization of water mist sprays using a phase-doppler-particle-analyzer and an iso-kinetic sampling probe
To date, the fire protection industry still relies primarily on the tried-and-true but expensive full-scale fire testing approach to develop water mist fire protection systems, due to the lack of design guidelines in the industry based on engineering first principles. This makes the development of many potential applications economically prohibitive due to the high cost for constructing a full-scale testing mockup. A Phase-Doppler-Particle-Analyzer (PDPA) was used to screen candidate water mist nozzles for use in a scaling validation aimed to allow scaled-down testing of water mist systems. A custom-designed iso-kinetic sampling probe (DCSP) was developed to independently measure water mist fluxes at the same locations where PDPA measurements were made. Measurements were taken at two elevations in selected full-cone water mist sprays. The water drop size was found to increase with radial distance from the spray centerline, while the mean drop velocity and drop concentration decrease with radial distance. Gross drop size distributions of water mist sprays were derived from local drop size distributions and water fluxes measured in two spray cross sections. It was found that, for the water mist sprays investigated in this study, both Rosin-Rammler and lognormal distributions are required to correlate the entire drop size spectrum. In general, the agreement between the mist fluxes measured with the PDPA and iso-kinetic sampling was within 7 % near the spray centerline. The selected nozzles show appropriate intended scaling in terms of the drop size, nozzle discharge pressure, and water discharge rate.
Characterization of water mist sprays using a phase-doppler-particle-analyzer and an iso-kinetic sampling probe
Charakterisierung von Wassernebel-Sprays mit einem Phasen-Doppler-Partikelanalysator und einem isokinetischen Tastkopf
Ditch, Benjamin (author) / Yu, Hong-Zeng (author)
2004
10 Seiten, 16 Bilder, 3 Tabellen, 7 Quellen
Conference paper
English
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