Mixing of a point-source indoor pollutant: Numerical predictions and comparison with experiments

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In most practical estimates of indoor pollutant exposures, it is common to assume that the pollutant is uniformly and instantaneously mixed in the indoor space. It is also commonly known that this assumption is simplistic, particularly for point sources, and for short-term or localized indoor exposures. We report computational fluid dynamics (CFD) predictions of mixing time of a point-pulse release of a pollutant in an unventilated mechanically mixed isothermal room. We aimed to determine the adequacy of the standard RANS two-equation ({kappa}-{var_epsilon}) turbulence model to predict the mixing times under these conditions. The predictions were made for the twelve mixing ... continued below

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6 pages

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Lobscheid, C. & Gadgil, A.J. January 1, 2002.

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Description

In most practical estimates of indoor pollutant exposures, it is common to assume that the pollutant is uniformly and instantaneously mixed in the indoor space. It is also commonly known that this assumption is simplistic, particularly for point sources, and for short-term or localized indoor exposures. We report computational fluid dynamics (CFD) predictions of mixing time of a point-pulse release of a pollutant in an unventilated mechanically mixed isothermal room. We aimed to determine the adequacy of the standard RANS two-equation ({kappa}-{var_epsilon}) turbulence model to predict the mixing times under these conditions. The predictions were made for the twelve mixing time experiments performed by Drescher et al. (1995). We paid attention to adequate grid resolution, suppression of numerical diffusion, and careful simulation of the mechanical blowers used in the experiments. We found that the predictions are in good agreement with experimental measurements.

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6 pages

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OSTI as DE00791816

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  • Indoor Air 2002, Monterey, CA (US), 06/30/2002--07/05/2002

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  • Report No.: LBNL--49457
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 791816
  • Archival Resource Key: ark:/67531/metadc741988

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Office of Scientific & Technical Information Technical Reports

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

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  • January 1, 2002

Added to The UNT Digital Library

  • Oct. 19, 2015, 7:39 p.m.

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  • April 4, 2016, 1:38 p.m.

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Lobscheid, C. & Gadgil, A.J. Mixing of a point-source indoor pollutant: Numerical predictions and comparison with experiments, article, January 1, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc741988/: accessed November 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.