Aspiration and sampling efficiencies of louvered PM10 dichotomous inlet
Conference Paper
Overview
Overview
abstract
The louvered PM10 dichotomous inlet is the most popular PM 10 inlet used in aerosol sampling. Past wind tunnel studies focused only on the sampler's overall performance characteristics: the cut point and slope. This study attempted to get a more detailed picture of the inlet's performance by measuring simultaneously the aspiration, transmission and sampling efficiency. A new dust wind tunnel satisfying the USEPA's requirements was used for this study. Coarse Arizona Road dust was used as testing material. In each experiment, the dust deposited on the inner surface of the louvered top and the impaction plate were recovered to filters by a micro-vacuum. The PSD of the dust collected in all the filters were analyzed by Coulter Counter. The aspiration efficiency of the PM10 inlet was found to be greater than 1. The sampling efficiency of the louvered top decreased with increasing wind speeds. However, the cut point and slope of the overall PM10 inlet was not affected by the wind speed. The results of this study and the experimental methodology employed in this study will be useful in facilitating the design of future PM samplers.
