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Impact of Water Mist Extinguisher Construction on Parameters of Generated Drops

Jan KAŹMIERAK
Jan KAŹMIERAK
   | Jan 27, 2021
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Article Category: research-article
Published Online: Jan 27, 2021
Page range: 99 - 104
Received: Oct 30, 2020
Accepted: Nov 23, 2020
DOI: https://doi.org/10.21307/acee-2020-034
Keywords
© 2020 Jan Kaźmierak published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1.

Decomposition of a membrane created by opposite, colliding flows a) symmetrical waves, b) asymmetrical waves, c) spraying of liquid. Source: [11]
Decomposition of a membrane created by opposite, colliding flows a) symmetrical waves, b) asymmetrical waves, c) spraying of liquid. Source: [11]

Figure 2.

Spraying nozzles in tested extinguishers. Where: a) Water mist extinguisher A 6l 15bars, b) Water mist extinguisher B 6l 12bars, c) Water mist extinguisher C 6l 15bars Source: own study
Spraying nozzles in tested extinguishers. Where: a) Water mist extinguisher A 6l 15bars, b) Water mist extinguisher B 6l 12bars, c) Water mist extinguisher C 6l 15bars Source: own study

Figure 3.

Scheme of the test bench, where: 1 – computer and software, 2 – drop spectrum analyzer, 3 – tested extinguisher, 4 – measuring probe of the drop spectrum analyzer. Source: own study
Scheme of the test bench, where: 1 – computer and software, 2 – drop spectrum analyzer, 3 – tested extinguisher, 4 – measuring probe of the drop spectrum analyzer. Source: own study

Figure 4.

Representative curves for total quantitative share of drops Source: own study
Representative curves for total quantitative share of drops Source: own study

Figure 5.

Representative curves for total volumetric share of drops Source: own study
Representative curves for total volumetric share of drops Source: own study

Results of the analysis of extinguishing medium dispersion Source: own study

Water Mist Extinguisher J Dxy (um)
A 1.16 728.87
B 1.03 564.03
C 0.86 1102.73

Ranges by volume for groups of 90% and 99%. Source: own study

Water Mist Extinguisher Dv0.90 (mm) Dv0.99 (mm)
Sample 1 Sample 2 Sample 3 Sample 1 Sample 2 Sample 3
A 1040÷1045 1271÷1276 1271÷1276 1320÷1326 1370÷1375 1370÷1375
B 990÷996 1007÷1012 979÷985 1309÷1315 1304÷1309 1271÷1276
C 1892÷1902 2378÷2389 2327÷2337 2347÷2358 2616÷2627 2565÷2575

Mathematical dependencies of mean diameters of drops. Where: Δn – share of drops with a D diameter. Source: [11, 12]

Mean diameter Symbol Formula
Arithmetic Dn D n = ∑ D Δ n ∑ Δ n
Surface Ds D s = ∑ D 2 Δ n ∑ Δ n
Volume Dv D v = ∑ D 3 Δ n ∑ Δ n 3
Sauter Da D a = ∑ D 3 Δ n ∑ D 2 Δ n

Results of testing mean diameters of drops. Source: own study

Water Mist Extinguisher Dn Ds Dv Da
A 441.80 (12. 76) 517.07 (12,97) 57 9.93 (12.9 0) 728.87 (11.72)
B 326. 43 (3.83) 385.53 (4,21) 437.70 (4. 28) 564.03 (4.45)
C 508.30 (6.06) 639.70 (9,75) 766.50 (12.60) 1102.73 (18.47)
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