Size Distribution and Filtering Characteristics of Pressure Dissolved Oxygen Ultrafine Bubbles
R. Norarat1, V. Thonglek2, and Y. Ueda3
1 Faculty of Science and Agricultural technology, Rajamangala University of Technology Lanna
2 Faculty of Engineering, Rajamangala University of Technology Lanna
3 Research Institute for Sustainable Humanosphere, Kyoto University
Abstract
To understand the properties of oxygen ultrafine bubbles (O2-UFB), we examined the evolution of the size distribution and the number density of O2-UFB water at various O2-UFB generation times. Results show that the UFB concentration increased with increasing generation time and the O2-UFB size distribution was shifted to smaller sizes after longer generation times. In addition, the results suggested that O2-UFBs need time to stabilize and achieve smaller sizes. UFBs remained in the water after storage for 7 days, but the water became contaminated by bacteria. Furthermore, a hydrophilic filter is recommended for medical applications because it blocks the particles but allows the passage of fine bubbles. It was found that the choice of the hydrophilic filter material affects the O2-UFB transport rate and concentration.
Keywords - ultra fine bubbles, dissolved oxygen, concentration, filtering, size distribution
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