Conclusions
This study measured the BSD of MBs
generated with the recommended
manual method using the
microscopic shadow imaging technique. The MBs generated by the different
operators were pushed through a transparent flow test section, and their
images were taken by a microscope and a camera. After processing and
analyzing the images, the BSD of the
MBs was obtained. The data show that the diameter of MBs is mainly
distributed between 10-100 µm, the
mean bubble size is between 21-34 μm, the D32 is mainly
between 50-300 μm, and the standard deviation is between 6-17 μm in
60 experiments. The data revealed
the differences in the size distribution of manual operation bubbles for
the different operators with different strengths. These findings are
important for the future development of c-TCD. In our future work, the
influence of different bubble sizes on the accuracy of c-TCD will be
studied. A more suitable MBs generation procedure or device with high
reliability will be developed to replace human manual operation in our
future studies.