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Evaluation of Electro-sprayer Performance by Using Fluorescent Tracer
DONGBIN KWAK, Seong Chan Kim, Thomas H. Kuehn, David Y. H. Pui, University of Minnesota
Abstract Number: 654
Working Group: Indoor Aerosols
Abstract
Due to the ongoing COVID-19 pandemic situation, evaluation to mitigate the risk of transmission of the SARS-CoV-2 virus in an indoor environment are urgently required. Among the various types of disinfectant methods, electro-spraying is often applied to decontamination in public places due to its unique characteristics. Monomodal distribution with a peak size of ~100 µm occurred for the uncharged droplets, but if there is an electrostatic charge on the droplets, a bimodal distribution with peak sizes of ~10 and ~100 µm was found. As a result, the increase of effective contact area due to small progeny droplets was determined as 30-50% for the same sprayed amount of solution. The wraparound effect was examined on two different cylinders: copper (Cu) and polyvinyl chloride (PVC) pipe. When the target surface was not charged (Cu 0 kV and PVC 0 kV), the average normalized concentrations on the back side of the cylinder (????=180o) was increased by around 67% for charged droplets. However, when the target surface was highly charged (PVC –19 kV), the average normalized concentrations at ????=180o was increased more than two times for charged droplets.