Effect of Helical Pipe's Design Factors on Bubble Size of Splitting-type Fine Bubble Generator

helical pipe;fine bubble;micro/nano bubble;shear force;dissolved oxygen;splitter;624

공과대학 건설환경공학부 ;

University:서울대학교 대학원

关键词: helical pipe;    fine bubble;    micro/nano bubble;    shear force;    dissolved oxygen;    splitter;    624;   

Others  :  http://s-space.snu.ac.kr/bitstream/10371/124330/1/000000133674.pdf

美国|英语

来源: Seoul National University Open Repository

【 摘 要 】

One of the basic principles of generating fine bubbles (micro/nano bubbles) is splitting the bubbles into smaller bubbles by the wall shear force of a long and straight pipe, which is called a splitter. The aim of this study is to analyze the effect of changing a straight pipe into a helical pipe in a splitting-type bubble generator. The effects of changing each design factor on bubble generation were analyzed using shear force modeling by computational fluid dynamics (CFD), dissolved oxygen (DO) concentration experiment, and bubble size image analysis with confocal microscopy for 10 different designs of splitters. The results indicated that, with the introduction of a helical radius, the shear force exerted on pipe flow increased, the measured DO concentration increased, and the bubble size decreased. These findings indicate that a helical pipe offers distinct advantages over a straight pipe. Therefore, the introduction of a helical pipe as a splitter would be beneficial in increasing the efficiency of a splitting-type bubble generator.