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An Alternative Method for Thermal Plume–Induced Aerosol Release and Deposition Calculations in Large Geometries Using fireFoam

Being a particle physics laboratory, the European Organization for Nuclear Research (CERN) plans, constructs, and maintains installations emitting ionizing radiation during operation. Activation of present material is a consequence. Hence, fire scenarios for certain CERN installations must take into...

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Autores principales: Plagge, Michael, Krause, Ulrich, Da Riva, Enrico, Schäfer, Christoph, Forkel-Wirth, Doris
Lenguaje:eng
Publicado: 2017
Materias:
Acceso en línea:https://dx.doi.org/10.1080/00295450.2017.1291227
http://cds.cern.ch/record/2275969
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author Plagge, Michael
Krause, Ulrich
Da Riva, Enrico
Schäfer, Christoph
Forkel-Wirth, Doris
author_facet Plagge, Michael
Krause, Ulrich
Da Riva, Enrico
Schäfer, Christoph
Forkel-Wirth, Doris
author_sort Plagge, Michael
collection CERN
description Being a particle physics laboratory, the European Organization for Nuclear Research (CERN) plans, constructs, and maintains installations emitting ionizing radiation during operation. Activation of present material is a consequence. Hence, fire scenarios for certain CERN installations must take into account the presence of radioactive material. Releases of gaseous, liquid, or solid combustion products, e.g., attached to aerosols, are taken so far into account by a worst case approach. Scenarios taking place in underground installations assume hence a smoke transport coefficient of 100% of release toward the surface level, independent of the local geometry. For a radioactive inventory identified in a certain fire load, this results in a conservative release. To overcome this conservative worst case approach, a computational fluid dynamics model based on FM Global’s fireFoam 2.2.x is proposed. Its Lagrangian library was modified in order to provide aerosol release and deposition information based on more detailed interaction data between Lagrangian particles and their surrounding geometry. Results are shown for a CERN-typical large-scale experimental cavern placed 100 m below surface level. A simple diffusion burner is modeled inside the cavern to create a thermal plume emerging from a 1.5-MW fire over 14 min. Lagrangian particles are used to model aerosols with an aerodynamic diameter of 1, 10, and 100 μm, injected into the emerging thermal plume. Results for particle release and deposition vary according to aerodynamic diameter. In the present case, maximums of ~32% and 39% are found for 1- and 10-μm particles, respectively, being released to the surface level.
id oai-inspirehep.net-1611624
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
record_format invenio
spelling oai-inspirehep.net-16116242019-09-30T06:29:59Zdoi:10.1080/00295450.2017.1291227http://cds.cern.ch/record/2275969engPlagge, MichaelKrause, UlrichDa Riva, EnricoSchäfer, ChristophForkel-Wirth, DorisAn Alternative Method for Thermal Plume–Induced Aerosol Release and Deposition Calculations in Large Geometries Using fireFoamEngineeringBeing a particle physics laboratory, the European Organization for Nuclear Research (CERN) plans, constructs, and maintains installations emitting ionizing radiation during operation. Activation of present material is a consequence. Hence, fire scenarios for certain CERN installations must take into account the presence of radioactive material. Releases of gaseous, liquid, or solid combustion products, e.g., attached to aerosols, are taken so far into account by a worst case approach. Scenarios taking place in underground installations assume hence a smoke transport coefficient of 100% of release toward the surface level, independent of the local geometry. For a radioactive inventory identified in a certain fire load, this results in a conservative release. To overcome this conservative worst case approach, a computational fluid dynamics model based on FM Global’s fireFoam 2.2.x is proposed. Its Lagrangian library was modified in order to provide aerosol release and deposition information based on more detailed interaction data between Lagrangian particles and their surrounding geometry. Results are shown for a CERN-typical large-scale experimental cavern placed 100 m below surface level. A simple diffusion burner is modeled inside the cavern to create a thermal plume emerging from a 1.5-MW fire over 14 min. Lagrangian particles are used to model aerosols with an aerodynamic diameter of 1, 10, and 100 μm, injected into the emerging thermal plume. Results for particle release and deposition vary according to aerodynamic diameter. In the present case, maximums of ~32% and 39% are found for 1- and 10-μm particles, respectively, being released to the surface level.oai:inspirehep.net:16116242017
spellingShingle Engineering
Plagge, Michael
Krause, Ulrich
Da Riva, Enrico
Schäfer, Christoph
Forkel-Wirth, Doris
An Alternative Method for Thermal Plume–Induced Aerosol Release and Deposition Calculations in Large Geometries Using fireFoam
title An Alternative Method for Thermal Plume–Induced Aerosol Release and Deposition Calculations in Large Geometries Using fireFoam
title_full An Alternative Method for Thermal Plume–Induced Aerosol Release and Deposition Calculations in Large Geometries Using fireFoam
title_fullStr An Alternative Method for Thermal Plume–Induced Aerosol Release and Deposition Calculations in Large Geometries Using fireFoam
title_full_unstemmed An Alternative Method for Thermal Plume–Induced Aerosol Release and Deposition Calculations in Large Geometries Using fireFoam
title_short An Alternative Method for Thermal Plume–Induced Aerosol Release and Deposition Calculations in Large Geometries Using fireFoam
title_sort alternative method for thermal plume–induced aerosol release and deposition calculations in large geometries using firefoam
topic Engineering
url https://dx.doi.org/10.1080/00295450.2017.1291227
http://cds.cern.ch/record/2275969
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