Figure 1.
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
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
Table 1.
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 |
Table 2.
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) |
Table 3.
Mathematical dependencies of mean diameters of drops. Where: Δn – share of drops with a D diameter.
| Mean diameter | Symbol | Formula |
|---|---|---|
| Arithmetic | Dn | |
| Surface | Ds | |
| Volume | Dv | |
| Sauter | Da |
Figure 4.
Representative curves for total quantitative share of drops Source: own study
Figure 5.
Representative curves for total volumetric share of drops Source: own study