Particle and Aerosol Research
Vol. 13, No. 4, December 2017, Pages 151-158
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ISSN : 1738-8716 (Print)
ISSN : 2287-8130 (Online)
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Size measurement of electrosprayed droplets using
shadowgraph visualization method
Min-Jeong Oh1),2), Sung-Hyun Kim2), and Myong-Hwa Lee1),2) *
1)Thermochemical Energy System R&D Group, Korea Institute of Industrial Technology
2)Department of Chemical and Biological Engineering, Korea University
*Corresponding author.
Tel.: +82-41-589-8268, E-mail: myonghwa@kitech.re.kr
Received 08 October 2017, Revised 07 November 2017, Accepted 13 November 2017, Available online 03 January 2018
http://dx.doi.org/10.11629/jpaar.2017.12.30.151
Abstracts
Electrostatic precipitator is widely used to remove particulate matters in indoor air and industrial flue gas due to
low pressure drop and high collection efficiency. However, it has a low collection efficiency for the submicrometer
sized particles. Electrospraying is a potential method to increase the particle charging efficiency, which results in
increased collection efficiency. Although particle charging efficiency is highly dependent upon droplet size, the
effective measuring method of the droplets is still uncertain. Tap water was electrosprayed in this study, and the
images of electrosprayed droplets were taken with a high speed camera coupled with several visualization methods in
order to measure the droplets size. The droplet size distribution was determined by an image processing with an
image-J program. As a result, a droplet measured by a laser visualization, had a half size of that by a Xenon light
visualization. In addition, the experimentally measured droplet sizes were a good agreement with the predicted values
suggested by Fernández de la Mora and Loscertales(1994).
Keywords
Electrospray, Visualization, Charged droplet, Conductivity, Surface tension
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