Research On Micro-nanobubble Generator

Micro bubbles, featured with small size, comparatively big surface, high adhesive efficiency, low floating speed in water, play an important role in the application fields such as air floatation water purification, water reoxygenation, pharmacy, and precise chemical reaction. But there are two kinds of problems in the promotion of micro bubbles in the light of their application fields. For one thing, in respect of water purification and water reoxygenation, the problem lies in how to produce abundant micro bubbles effectively. For another thing, how to precisely control the size of the micro bubbles in the case of pharmacy and precise chemical reaction, which are critical of the bubble size.Based on these two problems, investigations and analysis of the current abundant micro bubble generation technology and the size-controllable micro bubble technology have been taken in this paper. In respect to the abundant micro bubble generation, we proposed a micro bubble generation method with the principle of throttle orifice. In contrast to the current designs, it bears the advantages of compact structure, high mobility, and working submerged under water. Based on the above principle, we further designed a model of throttle orifice micro bubble generator on account of our calculating and fluid simulation results. After that, experiment of micro bubble generating in the pool as well as bubble features measurement have been conducted. It proves that the floating time and size distribution of the microbubbles are better than the existing abundant microbubble generators.As to the size-controllable nanobubble generation, we proposed a method of electrolyzation by microprobe. Compared with the existing methods, it has the advantages of low fabrication requirements and high control precise. We then set up a mathematical model on the principle of electrolyzation by microprobe to generate size-controllable microbubbles, and designed a model device of bubble generator. We also built a test platform to evaluate the characteristics of our model device. According to the test results, our model device can precisely control the size and space interval of the generating microbubbles. Notably, it surpasses the existing size-controllabe microbubble generator in the features of the minimun bubble size and size deviation.In the end of this paper, we discussed the shortcomings and their improvements of our two designs.