Jaques Peter A, Hsiao Ta-Chih, Gao Pengfei
URS Corporation, Pittsburgh, PA 15236, USA.
Ann Occup Hyg. 2011 Aug;55(7):784-96. doi: 10.1093/annhyg/mer062.
A recirculation aerosol wind tunnel was designed to maintain a uniform airflow and stable aerosol size distribution for evaluating aerosol sampler performance and determining particle penetration through protective clothing materials. The oval-shaped wind tunnel was designed to be small enough to fit onto a lab bench, have optimized dimensions for uniformity in wind speed and particle size distributions, sufficient mixing for even distribution of particles, and minimum particle losses. Performance evaluation demonstrates a relatively high level of spatial uniformity, with a coefficient of variation of 1.5-6.2% for wind velocities between 0.4 and 2.8 m s(-1) and, in this range, 0.8-8.5% for particles between 50 and 450 nm. Aerosol concentration stabilized within the first 5-20 min with, approximately, a count median diameter of 135 nm and geometric standard deviation of 2.20. Negligible agglomerate growth and particle loss are suggested. The recirculation design appears to result in unique features as needed for our research.
设计了一种再循环气溶胶风洞，以维持均匀的气流和稳定的气溶胶粒径分布，用于评估气溶胶采样器的性能以及确定颗粒透过防护服材料的穿透率。椭圆形风洞设计得足够小，可以放置在实验室工作台上，具有优化的尺寸以实现风速和粒径分布的均匀性，具备充分的混合以实现颗粒的均匀分布，并且颗粒损失最小。性能评估表明空间均匀性水平相对较高，风速在0.4至2.8 m s(-1)之间时变异系数为1.5 - 6.2%，在此范围内，粒径在50至450 nm之间的颗粒变异系数为0.8 - 8.5%。气溶胶浓度在最初的5 - 20分钟内稳定下来，计数中值直径约为135 nm，几何标准差为2.20。表明团聚体生长和颗粒损失可忽略不计。再循环设计似乎产生了我们研究所需的独特特性。
