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Development of a Mini-Cyclone and a Small Impactor for Sampling Nanoparticles

Ta-Chih Hsiao  
【摘要】:In this study, two "quarter-size" mini-cyclones were developed to remove particles larger than 1.0 and 0.3 μm under a very low flow rate of 0.3 lpm, and two small impactors were also developed to remove particles larger than 0.3 μm at a low flow rate of 0.3 lpm. They are ideal devices to adapt to current instruments to prevent particle contamination/interference or work independently as a personal sampler. The geometric configuration of the mini-cyclones is referring to the Extra-Sharp-Cut cyclone (ESCC) series [1]. However, the mini-cyclones were newly designed to reach the cutoff sizes (d50) of 1.0 and 0.3 micro-meter under 0.3 lpm, and the empirical equation provided by Kenny and Gussman cannot be used for predicting the d50 of these mini-cyclones. The nozzle dimensions of the small impactors are referring to the seventh stage of the Microorifice Uniform Deposit Impactor [2]. The performances of the mini-cyclones and the small impactor were evaluated in terms of penetration and pressure drop. To acquire the penetration curve and determine d50, the upstream and downstream particle distributions of the mini-cyclone and the small impactor were measured by Scanning Mobility Particle Sizer (SMPS, TSI Inc., Model 3096) and Aerodynamic Particle Sizer (APS, TSI Inc., Model 3321). For mini-cyclone performance evaluation, four different flow rates, i.e., 0.3, 1.2, 1.6, and 2.0 lpm were tested. In general, the d50 decreases with increasing the aerosol flow rate. On the other hand, the pressure drops of both mini-cyclones and small impactors increase with the flow rate in a quadratic form. The performance of mini-cyclones was also compared with that of existing personal sampling cyclones. Further, empirical models to estimate the performance of the prototype mini-cyclones (i.e., the 50% cutoff particle size and pressure drop) were also established.

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