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本文报告硬塑料长取样管道对气溶胶取样结果的影响。实验用气溶胶的质量中位空气动力学直径为7.1μm,几何标准偏差为1.9。气溶胶分别经φ30mm 和φ50mm 的15m 长管道(均包括5个弯头)后,其质量浓度发生了变化,层流时(30L/min)分别降至原来的14.5%和6.4%,紊流时(100L/min)分别降至原来的21.3%和15.4%;气流中粒谱也发生变化,使小于4μm 的粒子的质量份额增加4倍左右。文中还简单介绍了测定壁沉积份额和粒谱变化的方法,并对取样管道的选择和应用中的有关问题进行讨论。
This article reports the effect of long plastic tubing on aerosol sampling results. The experimental aerosol has a mass median aerodynamic diameter of 7.1 μm and a geometric standard deviation of 1.9. The mass concentration of aerosols changed from 15m long pipes (all including 5 elbows) of φ30mm and φ50mm to 14.5% and 6.4% respectively when laminar flow (30L / min) (100L / min) were reduced to 21.3% and 15.4% of the original, respectively. The gas chromatogram also changed, which increased the mass fraction of particles smaller than 4μm by about 4 times. The article also briefly introduced the method of determining the deposition percentage of the wall and the change of the particle size distribution, and discussed the selection and application of the sampling pipe.