Indoor pollutant mixing time in an isothermal closed room: An investigation using CFD

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We report on computational fluid dynamics (CFD) predictions of mixing time of a pollutant in an unventilated, mechanically mixed, isothermal room. The study aims to determine: (1) the adequacy of the standard Reynolds Averaged Navier Stokes two-equation ({kappa}-{var_epsilon}) turbulence model for predicting the mixing time under these conditions and (2) the extent to which the mixing time depends on the room airflow, rather than the source location within the room. The CFD simulations modeled the 12 mixing time experiments performed by Drescher et al. (Indoor Air 5 (1995) 204) using a point pulse release in an isothermal, sealed room mechanically ... continued below

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page(s) 5577-5586

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Gadgil, A.J.; Lobscheid, C.; Abadie, M.O. & Finlayson, E.U. July 1, 2003.

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Description

We report on computational fluid dynamics (CFD) predictions of mixing time of a pollutant in an unventilated, mechanically mixed, isothermal room. The study aims to determine: (1) the adequacy of the standard Reynolds Averaged Navier Stokes two-equation ({kappa}-{var_epsilon}) turbulence model for predicting the mixing time under these conditions and (2) the extent to which the mixing time depends on the room airflow, rather than the source location within the room. The CFD simulations modeled the 12 mixing time experiments performed by Drescher et al. (Indoor Air 5 (1995) 204) using a point pulse release in an isothermal, sealed room mechanically mixed with variable power blowers. Predictions of mixing time were found in good agreement with experimental measurements, over an order of magnitude variation in blower power. Additional CFD simulations were performed to investigate the relation between pollutant mixing time and source location. Seventeen source locations and five blower configurations were investigated. Results clearly show large dependence of the mixing time on the room airflow, with some dependence on source location. We further explore dependence of mixing time on the velocity and turbulence intensity at the source location. Implications for positioning air-toxic sensors in rooms are briefly discussed.

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page(s) 5577-5586

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  • Journal Name: Atmospheric Environment; Journal Volume: 37; Journal Issue: 39-40; Other Information: Journal Publication Date: Dec. 2003

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  • Report No.: LBNL--51413
  • Grant Number: AC03-76SF00098
  • DOI: 10.1016/j.atmosenv.2003.09.032 | External Link
  • Office of Scientific & Technical Information Report Number: 820651
  • Archival Resource Key: ark:/67531/metadc737635

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • July 1, 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 4, 2016, 1:16 p.m.

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Gadgil, A.J.; Lobscheid, C.; Abadie, M.O. & Finlayson, E.U. Indoor pollutant mixing time in an isothermal closed room: An investigation using CFD, article, July 1, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc737635/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.