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Details van artikel 7 van 11 gevonden artikelen
| Titel: |
Particle Deposition in Museums: Comparison of Modeling and Measurement Results |
| Auteur: |
Nazaroff, William W. Ligocki, Mary P. Ma, Timothy Cass, Glen R. |
| Verschenen in: |
Aerosol science and technology |
| Paginering: | Jaargang 13 (1990) nr. 3 pagina's 332-348 |
| Jaar: |
1990 |
| Inhoud: |
Deposition of airborne particles may lead to soiling and /or chemical damage of objects kept indoors, including works of art in museums. Measurements recently were made of the deposition velocity of fine particles (diameter range: 0.05-2.1 μm) onto surfaces in five Southern California museums. In this paper, theoretical predictions of particle deposition velocities onto vertical surfaces are developed for comparison against the experimental results. Deposition velocities are calculated from data on surface-air temperature difference and near-wall air velocity using idealized representations of the air flow field near the wall. For the five sites studied, the wall-air temperature differences were generally in the range of a few tenths to a few degrees Kelvin. Average air velocities measured at 1 cm from the wall were in the range 0.08-0.19 m s-1. Based on a combination of modeling predictions and measurement results, the best estimate values of deposition velocity for the wall studied at each site are obtained. These values are in the range (1.3-20) × 10-6 m s-1 for particles with 0.05-μm diameter and (0.1-3.3) × 10-6 for particles with 1-μm diameter. The range of 15-30 in deposition velocity for a given particle size is due primarily to differences among sites in the near-wall air flow regime, with the low and high values associated with forced laminar flow and homogeneous turbulence in the core of the room, respectively. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 7 van 11 gevonden artikelen
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