JAPANESE JOURNAL OF MULTIPHASE FLOW
Online ISSN : 1881-5790
Print ISSN : 0914-2843
ISSN-L : 0914-2843
A Study of the Measurement of Bubbles in Microbubble Generation Device
Rongsheng ZHANGShinji HAYAMAShigeo FUJIKAWANobuhide TAKASUGI
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2000 Volume 14 Issue 3 Pages 329-338

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Abstract

This paper deals with a method of discriminating microbubbles from images of bubbly water taken by one CCD camera and of determining their diameter and number density. The diameters of nearly spherical microbubbles and the ratio of the shortest semi-axis to the longest one are determined from bubble images, and the ratio is used to separate the defocused bubbles far from the measuring domain. The ratio of the minimum and the maximum gray level of microbubble in the focal field of the CCD camera is used to discriminate bubbles inside an observation field. It is shown that the effective depth of the observation field is 200μm in the present experimental set-up. It is concluded that the method can be applied to determine diameter and number density of microbubbles.

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© The Japanese Society for Multiphase Flow
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