Comparison between a Conventional and a New IRS Device in Terms of Air Entrainment: An Experimental and Numerical Analysis
An experimental study was conducted on a laboratory-scale new infrared suppression (IRS) device to assess the mass entrainment of ambient air into it under various operating conditions. A numerical analysis was also undertaken to assess the mass entrainment rate against pertinent input parameters in...
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Published in | Journal of ship research Vol. 64; no. 4; pp. 357 - 371 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
SNAME
01.12.2020
The Society of Naval Architects and Marine Engineers |
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Abstract | An experimental study was conducted on a laboratory-scale new infrared suppression (IRS) device to assess the mass entrainment of ambient air into it under various operating conditions. A numerical analysis was also undertaken to assess the mass entrainment rate against pertinent input parameters independently. The numerical results were validated against the experimental data to ensure the reliability of the numerical analysis of the new IRS device at real scales. The numerical method solves the three-dimensional, incompressible Navier-Stokes equations; the mass continuity equation; and the two-equation-based eddy viscosity model for the turbulent k-epsilon equations in the flow field. Numerical assessment of the air entrainment was performed for the conventional and the newly proposed IRS devices. A number of experiments on the new IRS device were carried out under various operating conditions. From the numerical study, it was observed that the conventional IRS device performs better than the new IRS device up to a geometric ratio of 1.4 (which is the ratio of diameters of the successive funnels used in an IRS device). Beyond the geometric ratio of 1.4, the newly proposed IRS device outperforms the conventional one significantly. For the new IRS device, the maximum mass entrainment was found to occur when four funnels were used and the nozzle was kept in flush condition with the lower opening of the bottom-most funnel. Mass entrainment increases with the nozzle-exit Reynolds number for the range of values considered in the study. |
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AbstractList | An experimental study was conducted on a laboratory-scale new infrared suppression (IRS) device to assess the mass entrainment of ambient air into it under various operating conditions. A numerical analysis was also undertaken to assess the mass entrainment rate against pertinent input parameters independently. The numerical results were validated against the experimental data to ensure the reliability of the numerical analysis of the new IRS device at real scales. The numerical method solves the three-dimensional, incompressible Navier-Stokes equations; the mass continuity equation; and the two-equation-based eddy viscosity model for the turbulent k-epsilon equations in the flow field. Numerical assessment of the air entrainment was performed for the conventional and the newly proposed IRS devices. A number of experiments on the new IRS device were carried out under various operating conditions. From the numerical study, it was observed that the conventional IRS device performs better than the new IRS device up to a geometric ratio of 1.4 (which is the ratio of diameters of the successive funnels used in an IRS device). Beyond the geometric ratio of 1.4, the newly proposed IRS device outperforms the conventional one significantly. For the new IRS device, the maximum mass entrainment was found to occur when four funnels were used and the nozzle was kept in flush condition with the lower opening of the bottom-most funnel. Mass entrainment increases with the nozzle-exit Reynolds number for the range of values considered in the study. |
Author | Dash, Sukanta K. Ganguly, Viplove Ranjan |
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CitedBy_id | crossref_primary_10_1080_10407782_2024_2328763 crossref_primary_10_1016_j_applthermaleng_2023_121866 crossref_primary_10_1016_j_icheatmasstransfer_2022_106004 crossref_primary_10_1080_10407782_2023_2189189 crossref_primary_10_1016_j_icheatmasstransfer_2022_106429 crossref_primary_10_1016_j_icheatmasstransfer_2023_106838 crossref_primary_10_1080_10407782_2024_2343034 crossref_primary_10_1016_j_tsep_2023_102011 crossref_primary_10_1115_1_4055263 crossref_primary_10_1115_1_4056368 crossref_primary_10_1016_j_ijthermalsci_2023_108196 crossref_primary_10_1115_1_4056223 crossref_primary_10_1016_j_ijthermalsci_2023_108296 |
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Title | Comparison between a Conventional and a New IRS Device in Terms of Air Entrainment: An Experimental and Numerical Analysis |
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