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Impact of water mist extinguisher construction on parameters of generated drops

Kaźmierak Jan

Architecture Civil Engineering Environment

2020

Vol. 13, no. 4

99--104

The paper analyses the impact that the construction of water mist extinguishers exerts on the size of generated drops. The test was based on the examination of three extinguishers of two producers, which have been available in the market in recent years. The test was carried out with the use of the IPS Drop Spectrum Analyzer (DSA). The device operates by using the photoelectric method to measure the parameters of the extinguishing stream microstructure. There were two measuring ranges: 0_1 414 μm and 0_2 658 μm. The test results present mean diameters of the generated drops, aggregated curves representative of their share as well as the analysis of the quality of spraying the extinguishing medium. The tests have shown that two out of three tested extinguishers do not generate water mist with standard parameters at a distance of 170 cm. The smallest mean diameters of drops were generated by extinguisher B, whereas the biggest ones by extinguisher C The highest level of spraying among all samples was found for extinguisher B. It’s Sauter diameter mean amounted to 564.03 μm. Further, it was shown what impact the construction of water mist extinguishers exerts on the size of generated drops.

Diffraction measurement methods of sizes of drops in quasi-monodispersive aerosol.

Opara T.A.

Optica Applicata

2000

Vol. 30, nr 4

735-755

The assumptions of a diffraction method of determining the sizes of drops in the stream of fuel aerosol are presented. The applicability range of the due conventional calculation methods is determined. The systematic errors due to the diversified sizes of drops in the sprayed stream of liquid are indicated. The formulae allowing both correction of the measured average diameter D and an approximate evaluation of the standard deviation a of the statistical distribution p(D) of drop sizes in the stream examined are derived.