Abstract
This research focuses on the utilization of acoustic wave to control the generation of microbubbles from a capillary tube, aiming for mass production with porous media. Initially. ultrasonic standing wave is employed to generate small-size microbubble since high amplitude is required for the pipette with smaller pore size which has high resistance. However, for large bubble generation, secondary acoustic radiation force between bubbles is increased and induces bubble coalescence. Pulsing wave can reduce the force strength by reducing wave cycles (apparent frequency) and increasing the distance between bubbles by controlling bubble generation frequency. Finally, maximum bubble generation frequency is calculated at each bubble size based on calculation of limiting factors such as gas permeability and secondary acoustic radiation force. The research will contribute to generate wide size range of multiple bubbles in aqueous solution and set up its limitation regarding bubble generation frequency through theoretical calculation. The data will be utilized for multiple bubble generation with porous media.
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