Have a personal or library account? Click to login
Impact of Water Mist Extinguisher Construction on Parameters of Generated Drops Cover

Impact of Water Mist Extinguisher Construction on Parameters of Generated Drops

Architecture, Civil Engineering, Environment
Volume 13 (2020): Issue 4 (December 2020)
By: Jan KAŹMIERAK  
Open Access
|Jan 2021

Figures & Tables

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 ExtinguisherJDxy (um)
A1.16728.87
B1.03564.03
C0.861102.73

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

Water Mist ExtinguisherDv0.90 (mm)Dv0.99 (mm)
Sample 1Sample 2Sample 3Sample 1Sample 2Sample 3
A1040÷10451271÷12761271÷12761320÷13261370÷13751370÷1375
B990÷9961007÷1012979÷9851309÷13151304÷13091271÷1276
C1892÷19022378÷23892327÷23372347÷23582616÷26272565÷2575

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

Mean diameterSymbolFormula
ArithmeticDn D n = ∑ D Δ n ∑ Δ n
SurfaceDs D s = ∑ D 2 Δ n ∑ Δ n
VolumeDv D v = ∑ D 3 Δ n ∑ Δ n 3
SauterDa D a = ∑ D 3 Δ n ∑ D 2 Δ n

Results of testing mean diameters of drops_ Source: own study

Water Mist ExtinguisherDn Ds Dv Da
A441.80 (12. 76)517.07 (12,97)57 9.93 (12.9 0)728.87 (11.72)
B326. 43 (3.83)385.53 (4,21)437.70 (4. 28)564.03 (4.45)
C508.30 (6.06)639.70 (9,75)766.50 (12.60)1102.73 (18.47)
DOI: https://doi.org/10.21307/acee-2020-034 | Journal eISSN: 2720-6947 | Journal ISSN: 1899-0142
Journal RSS Feed
Language: English
Page range: 99 - 104
Submitted on: Oct 30, 2020
Accepted on: Nov 23, 2020
Published on: Jan 27, 2021
Published by: Silesian University of Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year
Keywords:
Construction,
Drops,
Extinguisher,
Sprayed stream,
Water mist
Related subjects:
Architecture and design,
Architecture,
Architects, buildings

© 2021 Jan KAŹMIERAK, published by Silesian University of Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Previous articleVolume 13 (2020): Issue 4 (December 2020)Next article