Abstract
The difficulties of redispersing fine solid particles in a consistent manner are well known. Production of solid aerosols by redispersing bulk powders can be separated into two problems: feeding bulk powder at a desired rate, and dispersion of agglomerates within the bulk powder to produce an aerosol. A novel design for the feeding of bulk powders at the low rates suitable for exposure chamber studies is described. The feed mechanism consists of two rotating brushes, the larger of which supplies dust from a hopper to a second, spirally wound feed brush. The dust is conveyed through a tube to an aerosol dispersion device. The dual-brush dust-feed mechanism exhibits a coefficient of variation of 7.2% and 2.0%, based upon 5-minute averages of a western fly ash sample at feed rates of 6.23 mg/min and 21.1 mg/min, respectively. Feed rate was linearly related to the rotational speed of the feed-brush over the range examined. Principal advantages of the dust-feed mechanism are: excellent stability over periods a...
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