Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Apparatus for Screening Fire Suppression Efficiency of Dispersed Liquid Agents.

Published

Author(s)

Jiann C. Yang, Michelle K. Donnelly, N C. Prive, William L. Grosshandler

Abstract

This paper is an abridged version of NISTIR 6319. The design, construction, demonstration, and operation of a bench-scale device capable of screening the fire suppression efficiency of liquid agents are described in detail in this report. The apparatus is based on a well-characterized flame, a means to facilitate the introduction of liquid agents, and a way to generate liquid droplets. A Tsuji-type burner, a porous cylinder used in a counterflow diffusion configuration, is used. Both wake and enveloped flames can be maintained over a wide range of fuel and oxidizer flows. The flame is easily observed, and critical stages such as the blow-off limit (abrupt transition from an enveloped flame to a wake flame) can be ascertained with ease and high reproducibility. A small-scale vertical wind tunnel, which allows for the delivery of a uniform flow of oxidizer to the burner at a low turbulence intensity and also assists in the delivery of liquid agent droplets to the flame, is used for the flow facility. Two techniques of generating droplets have been examined: (1) a piezoelectric droplet generator and (2) a small glass nebulizer. The piezoelectric droplet generator was found incapable of handling fluids with high loading of dissolved solid due to frequent clogging of the orifice opening. The nebulizer is used in the current liquid screen apparatus.
Citation
Fire Safety Journal
Volume
36
Issue
No. 1

Keywords

fire suppression, diffusion flames, droplets, water additives, sprays, equipment

Citation

Yang, J. , Donnelly, M. , Prive, N. and Grosshandler, W. (2001), Apparatus for Screening Fire Suppression Efficiency of Dispersed Liquid Agents., Fire Safety Journal, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=911312 (Accessed April 16, 2024)
Created January 1, 2001, Updated February 19, 2017