Experimental and Numerical Study of the Discharge Performance of Particle-Laden Turbulent Flow
In the marine fire suppression system, continuous delivery of dry chemical powder to the fire source with long powder discharge range and high dispersion concentration is essential. The work is devoted to experimental and numerical studies of the flow characteristics of the dry chemical powder jet f...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-01-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/10/1/85 |
| _version_ | 1797492893175250944 |
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| author | Hongbo Shi Xikun Wang Qingjiang Xiang Gonghe Zhang Lin Xue |
| author_facet | Hongbo Shi Xikun Wang Qingjiang Xiang Gonghe Zhang Lin Xue |
| author_sort | Hongbo Shi |
| collection | DOAJ |
| description | In the marine fire suppression system, continuous delivery of dry chemical powder to the fire source with long powder discharge range and high dispersion concentration is essential. The work is devoted to experimental and numerical studies of the flow characteristics of the dry chemical powder jet from a horizontal injector with a wide range of Stokes numbers between 6 to 30 and Reynolds numbers between 4792 to 23,960 by considering the effect of gravitational acceleration. A CFD-based Eulerian–Eulerian multiphase model combined with Standard <i>k</i>-<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>ω</mi></semantics></math></inline-formula> turbulence model was used to predict flow characteristics of particle-laden jet using dimensionless numbers, including the solid volume fraction, the normalized velocity magnitude, and the turbulent viscosity ratio. Experimental studies have been carried out for three different inflow velocities (2.06, 2.45, and 2.81 m/s). The results indicate that the particle density plays a significant role in the dispersion of the particles in the radial and axial directions. The transition from U-shaped to V-shaped solid dispersion structure on the ground can be captured with the increase of particle density. Moreover, the higher level turbulence intensity enhances the solid dispersion concentration. Finally, it was found that the Portland cement powder exhibits better discharge performance in terms of solid discharge range and dispersion concentration in comparison with other dry powders. These results have implications in the design of powder-based fire suppression system. Further studies should aim to the in-depth research on the fire extinguishing mechanism of the Portland cement powder, especially the fire suppression effectiveness and thermal decomposition process. |
| first_indexed | 2024-03-10T01:11:14Z |
| format | Article |
| id | doaj.art-5999f76b030148b4bd65837782196ebe |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-10T01:11:14Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-5999f76b030148b4bd65837782196ebe2023-11-23T14:16:46ZengMDPI AGJournal of Marine Science and Engineering2077-13122022-01-011018510.3390/jmse10010085Experimental and Numerical Study of the Discharge Performance of Particle-Laden Turbulent FlowHongbo Shi0Xikun Wang1Qingjiang Xiang2Gonghe Zhang3Lin Xue4Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, ChinaResearch Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, ChinaResearch Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, ChinaResearch Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, ChinaShanghai Fire Research Institute of MEM, Shanghai 200032, ChinaIn the marine fire suppression system, continuous delivery of dry chemical powder to the fire source with long powder discharge range and high dispersion concentration is essential. The work is devoted to experimental and numerical studies of the flow characteristics of the dry chemical powder jet from a horizontal injector with a wide range of Stokes numbers between 6 to 30 and Reynolds numbers between 4792 to 23,960 by considering the effect of gravitational acceleration. A CFD-based Eulerian–Eulerian multiphase model combined with Standard <i>k</i>-<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>ω</mi></semantics></math></inline-formula> turbulence model was used to predict flow characteristics of particle-laden jet using dimensionless numbers, including the solid volume fraction, the normalized velocity magnitude, and the turbulent viscosity ratio. Experimental studies have been carried out for three different inflow velocities (2.06, 2.45, and 2.81 m/s). The results indicate that the particle density plays a significant role in the dispersion of the particles in the radial and axial directions. The transition from U-shaped to V-shaped solid dispersion structure on the ground can be captured with the increase of particle density. Moreover, the higher level turbulence intensity enhances the solid dispersion concentration. Finally, it was found that the Portland cement powder exhibits better discharge performance in terms of solid discharge range and dispersion concentration in comparison with other dry powders. These results have implications in the design of powder-based fire suppression system. Further studies should aim to the in-depth research on the fire extinguishing mechanism of the Portland cement powder, especially the fire suppression effectiveness and thermal decomposition process.https://www.mdpi.com/2077-1312/10/1/85particle-laden jet flowCFDEulerian–Euleriandry powdermarine fire-extinguishing technique |
| spellingShingle | Hongbo Shi Xikun Wang Qingjiang Xiang Gonghe Zhang Lin Xue Experimental and Numerical Study of the Discharge Performance of Particle-Laden Turbulent Flow Journal of Marine Science and Engineering particle-laden jet flow CFD Eulerian–Eulerian dry powder marine fire-extinguishing technique |
| title | Experimental and Numerical Study of the Discharge Performance of Particle-Laden Turbulent Flow |
| title_full | Experimental and Numerical Study of the Discharge Performance of Particle-Laden Turbulent Flow |
| title_fullStr | Experimental and Numerical Study of the Discharge Performance of Particle-Laden Turbulent Flow |
| title_full_unstemmed | Experimental and Numerical Study of the Discharge Performance of Particle-Laden Turbulent Flow |
| title_short | Experimental and Numerical Study of the Discharge Performance of Particle-Laden Turbulent Flow |
| title_sort | experimental and numerical study of the discharge performance of particle laden turbulent flow |
| topic | particle-laden jet flow CFD Eulerian–Eulerian dry powder marine fire-extinguishing technique |
| url | https://www.mdpi.com/2077-1312/10/1/85 |
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