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Measurements and Numerical Predictions of Liquid Agent Dispersal Around Solid Obstacles.


pdf icon Measurements and Numerical Predictions of Liquid Agent Dispersal Around Solid Obstacles. (1409 K)
Presser, C.; Widmann, J. F.; DesJardin, P. E.; Gritzo, L. A.

Halon Options Technical Working Conference. Proceedings. HOTWC 2001. Sponsored by: University of New Mexico, Fire Suppression Systems Assoc., Fire and Safety Group, GlobeTech, Inc., Halon Alternative Research Corp., Hughes Associates, Inc., Kidde, plc., Modular Protection, Corp., Next Generation Fire Suppression Technology Program, Sandia National Laboratories, Summit Environmental Corp., Inc. and 3M Specialty Materials. April 24-26, 2001, Albuquerque, NM, Daniels, B. L.; Cole, D. G., Editor(s)(s), 122-130 pp, 2001.

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Website: http://nmeri.unm.edu/cget/confinfo.htm

Keywords:

halon alternatives; computational fluid dynamics; validation; turbulence; fire suppression; droplets; halons

Abstract:

The focus of this effort is to investigate the dispersal of liquid agents around solid obstacles, and obtain a better understanding of the physical processes of droplet transport in cluttered spaces. A combined experimental-numerical study is presented to examine the flow field dynamics of highly turbulent flow over obstacles, and spray transport in such flow fields. Comparison of numerical predictions to the Particle imaging velocimetry (PIV) measurements shows good qualitative agreement in spatial distribution of the mean and RMS velocities with a 20% overprediction in mean streamwise velocity and 15% underprediction in RMS. A numerical sensitivity study using HFE-7100 agent reveals a strong dependency of droplet penetration on initial droplet size for the flow range and droplet sizes of interest in practical agent delivery systems.