Measuring droplet size distributions from overlapping interferometric particle images.
Interferometric particle imaging provides a simple way to measure the probability density function (PDF) of droplet sizes from out-focus images. The optical setup is straightforward, but the interpretation of the data is a problem when particle images overlap. We propose a new way to analyze the images. The emphasis is not on a precise identification of droplets, but on obtaining a good estimate of the PDF of droplet sizes in the case of overlapping particle images. The algorithm is tested using synthetic and experimental data. We next use these methods to measure the PDF of droplet sizes produced by spinning disk aerosol generators. The mean primary droplet diameter agrees with predictions from the literature, but we find a broad distribution of satellite droplet sizes.
Faculty of Applied Physics, Technische Universiteit Eindhoven, Eindhoven, The Netherlands.
Humberto
H
Bocanegra Evans
Faculty of Mechanical Engineering, Technische Universiteit Eindhoven, Eindhoven, The Netherlands.
Nico
N
Dam
Faculty of Applied Physics, Technische Universiteit Eindhoven, Eindhoven, The Netherlands.
Dennis
D
van der Voort
Faculty of Applied Physics, Technische Universiteit Eindhoven, Eindhoven, The Netherlands.
Guus
G
Bertens
Faculty of Applied Physics, Technische Universiteit Eindhoven, Eindhoven, The Netherlands.
Willem
W
van de Water