Malvern Spraytec Supports Work on Fire Safety Systems
20 October 2009: Malvern, UK: A new publication available on the Malvern Instruments website describes the use of the Spraytec laser diffraction particle size analyzer in the study of fire suppression systems. The work carried out by Professor André Marshall and colleagues in the Department of Fire Protection Engineering at the University of Maryland, supports the development of surfactant enhanced water mist fire suppression systems. These are intended to target difficult environments, such as fires in machinery spaces, which are traditionally extinguished using harmful gaseous suppressants.
For certain fires, applying water in a fine spray or mist can be particularly effective, reducing water usage and minimizing equipment damage. However, where fuel isolation is required, foams are particularly effective and a system that combines the benefits of water mists with those of fuel isolation using foams is one of the aims of this research. Surfactants, the principal components of foam concentrates, facilitate the formation and spread of air-water foams. The Spraytec was used in programmes designed to gain a greater understanding of the mechanisms underlying spray behaviours and to determine the impact of surfactants on the effectiveness of water mists.
The high concentrations, wide plume widths and high exit velocities of fire suppressing mists make accurate measurement of their droplet size characteristics challenging. However, the Spraytec overcomes these issues, which are common to many industrial sprays. Its high data acquisition rate enables rapid measurements to be made, capturing the dynamics of any spray process in great detail over a wide droplet size range (0.1 to 2000 microns). Patented algorithms automatically correct for the multiple scattering encountered with high concentration sprays, and its versatile optical bench allows the Spraytec to be used for sprays of all types.
For a full description of the Spraytec's application in fire suppression mists, download the complete article at www.malvern.com/article_water_mist
For further details of Professor Marshall's research work visit
http://www.fpe.umd.edu/faculty-profiles/marshall.html
About Malvern Instruments
Malvern Instruments provides a range of complementary materials characterization tools that deliver inter-related measurements reflecting the complexities of particulates and disperse systems, nanomaterials and macromolecules. Analytical instruments from Malvern are used in the characterization of a wide variety of materials, from industrial bulk powders to nanomaterials and delicate macromolecules. A broad portfolio of innovative technologies is combined with intelligent, user-friendly software. These systems deliver industrially relevant data enabling our customers to make the connection between micro (such as particle size) and macro (bulk) material properties (rheology) and chemical composition (chemical imaging).
Particle size, particle shape, zeta potential, molecular weight, chemical composition and rheological properties measurements are now joined by advanced chromatography solutions (GPC/SEC), extending Malvern's technologies for protein molecular weight, size and aggregation measurements, and synthetic polymer molecular weight and distribution. The company's laboratory, at-line, on-line and in-line solutions are proven in sectors as diverse as cement production and pharmaceutical drug discovery.
Headquartered in Malvern, UK, Malvern Instruments has subsidiary organizations in all major European markets, North America, China, Korea and Japan, a joint venture in India, a global distributor network and applications laboratories around the world. www.malvern.com
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