Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 11, 2022 - September 14, 2022
Fine bubbles with diameters of less than 100 μm are currently attracting considerable attentions because of their properties such as a large surface area per unit volume, low rising velocity, and self-pressurization due to surface tension. We found that fine bubbles with diameters of less than 100 μm can be easily generated by using a hollow cylindrical ultrasonic horn. Compared with to the conventional fine bubble generation method, which are wherein gas is supplying supplied gas to porous media and atomizing the gas is atomized with shear flow, this fine bubble generation method can generate small-sized air bubbles and mass circulation of the liquid phase is unnecessary. Therefore, this device is capable of generating MBs in any fluid, even in high-temperature, high-viscosity and high reactive materials. In this paper, we show the summary of fine bubble generation method using hollow ultrasonic horn, and also the example application of this method to fabrication process for hollow microcapsule and porous metals.
