Measurement and identification of ultrafine bubbles by resonant mass measurement method

Hideaki Kobayashi; Shigeo Maeda; Masakazu Kashiwa; Toshihiro Fujita

doi:10.1117/12.2064811

6 August 2014 Measurement and identification of ultrafine bubbles by resonant mass measurement method

Hideaki Kobayashi, Shigeo Maeda, Masakazu Kashiwa, Toshihiro Fujita

Proceedings Volume 9232, International Conference on Optical Particle Characterization (OPC 2014); 92320S (2014) https://doi.org/10.1117/12.2064811
Event: International Conference on Optical Particle Characterization (OPC 2014), 2014, Tokyo, Japan

Abstract

Various methods have been used to measure the particle size and number density of ultrafine bubbles generated by the ultrafine bubble generator, ultrafineGALF. The presence of particles with diameters of about 100 to 200 nm was indicated by every method that we used before. However, absolute identification of these as ultrafine bubbles rather than some other type of particle was not possible because conventional measurement methods using light generated by a laser and scattered by particles do not distinguish dust particles from bubbles. The present series of experiments, using the resonant mass measurement method, was the first to succeed in clearly distinguishing ultrafine bubbles from other particles. This was due to the use of the resonant mass measurement method, which is capable of distinguishing positively buoyant particles (bubbles) from negatively buoyant particles. In addition, the results from the resonant mass measurement method were compared, in terms of particle size distribution, with this from the particle tracking analysis method, which uses a different measurement principle. The particle size distributions yielded by both methods showed a moderate correlation between the number density results obtained by each.

Citation Download Citation

Hideaki Kobayashi, Shigeo Maeda, Masakazu Kashiwa, and Toshihiro Fujita "Measurement and identification of ultrafine bubbles by resonant mass measurement method", Proc. SPIE 9232, International Conference on Optical Particle Characterization (OPC 2014), 92320S (6 August 2014); https://doi.org/10.1117/12.2064811

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