Measurement of microbubbles size by Granulometry approach

Image processing by granulometry method is used to measuring microbubbles size distribution in this paper. In this method the size distribution of microbubbles in an image determines without explicitly detecting or segmenting each bubble first. Microbubbles with average sizes about 20 to 5300 micron and air volume fraction from 3 to 42 percent, which have been generated by a microbubble generator device, were measured. Estimated maximum and minimum sizes of microbubbles were compared to direct measuring of images. Excellent comparable results suggested using this method to determination of size distribution, for an extensive domain of void fractions especially in high void fractions while other image processing methods were confined to processing images of fully disperse phases.