Extraction of sizes and velocities of spray droplets by optical imaging method |
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Authors: | Yeonjun?Choo Email author" target="_blank">Boseon?KangEmail author |
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Affiliation: | (1) Department of Mechanical Engineering, Chonnam National University, 300, Yongbong-Dong, Buk-Gu, 500-757 Gwangju, Korea |
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Abstract: | In this study, an optical imaging method was developed for the measurements of the sizes and velocities of droplets in sprays.
Double-exposure single-frame spray images were captured by the imaging system. An image processing program was developed for
the measurements of the sizes and positions of individual particles including separation of the overlapped particles and particle
tracking and pairing at two time instants. To recognize and separate overlapping particles, the morphological method based
on watershed segmentation as well as separation using the perimeter and convex hull of image was used consecutively. Better
results in separation were obtained by utilization of both methods especially for the multiple or heavily-overlapped particles.
The match probability method was adopted for particle tracking and pairing after identifying the positions of individual particles
and it produced good matching results even for large particles like droplets in sprays. Therefore, the developed optical imaging
method could provide a reliable way of analyzing the motion and size distribution of droplets produced by various sprays and
atomization devices. |
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Keywords: | Optical Imaging Method Morphological Method Spray Droplet Particle Tracking Algorithm |
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