Development of a PM2.5 sampler with inertial impaction for sampling airborne particulate matter |
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Authors: | Panich Intra Artit Yawootti Usanee Vinitketkumnuen Nakorn Tippayawong |
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Affiliation: | 1. College of Integrated Science and Technology, Rajamangala University of Technology Lanna, Chiang Mai, 50300, Thailand 2. Department of Biochemistry, Faculty of Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand 3. Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai, 50200, Thailand
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Abstract: | A simple and low cost PM2.5 impactor for sampling airborne particulate matter was developed, designed and evaluated. The design was an assembly of an acceleration nozzle and an impaction plate. Particles with sufficient inertia were unable to follow air streamlines and impacted on the plate. Smaller particles followed the streamlines, avoided being captured by the plate and could then be collected on a downstream filter. Analytical and numerical models were formulated to predict collection efficiency, flow fields and vectors, and particle trajectories in the impactor. The modeling suggested that an optimal operational domain exists for the PM2.5 impactor. A prototype was then built and tested. The collected particles on the impaction plate and downstream of the PM2.5 impactor were analyzed by using scanning electron microscopy. Experimental results agreed well with the theoretical predictions. Testing of the PM2.5 impactor prototype showed promising results for this airborne particulate matter sampler. |
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