입자의 실시간 관측이 가능한 임팩터의 설계 및 성능해석

Abstract

Recently consideration of health and interest on bio aerosols have been growing steadily. In this study, inertial-timeobservation on the particles collected on impaction plate, and named Visual Impactor. Flow field and particletrajectory in the space between nozzle and impaction plate was analyzed numerically, and the collectionefciencies were calculated. Calibration and performance evaluation of the Visual Impactor was conducted withpolydisperse aerosols generated from 0.1% sodium chloride solution. Cut-was in good agreement with that from experimental results. Because of particle bounce and particle deposition onnozzle tip due to short jet-to-plate distance, the collection efficiencies from numerical and experimental analyseswere different slightly. Visual Impactor was used to collect airborne particles, and the features of collectedparticles could be seen in real-were sampled and compared one another. The features of collected airborne particles were dependent stronglyupon relative humidity. In addition, with hours elapsing, shapes and colors of collected particles were changed byevaporation and surface tension, etc.