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벤츄리 타입 마이크로버블 발생장치에서 스크류 구조 영향에 의한 기포 미립화에 대한 실험적 연구
이창훈(Chang Hun Lee),박수청(Su Chung Park),김경문(Koung Moon Kim),김지민(Ji Min Kim),김지훈(Ji Min Kim),한석원(Seok Won Han),서태일(Tae-Il Seo),권재성(jae Sung Kwon),김상문(Sang moon Kim),안호선(Ho Seon Ahn) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
This study was investigated of additional bubble breaking by screw shape in venturi-type air self-inhalation microbubble generator. In order to determine the influence of the varing flow characteristics (pressure and air flow rate) by screw shape, prior experiment was performed and evaluated. Furthermore, in order to identify the secondary flow caused by screw shape, a computational fluid dynamics (CFD) simulation was performed using the commercial CFD software ANSYS CFX-14.0. The analysis results showed that average rotational velocity in nozzle is inversely proportional to the size and number of microbubbles, acquiring from microbubble generation experiment.
소수성 미니채널 내 움직이는 접촉선을 가진 액체슬러그의 압력 강하에 대한 수치해석
전준호(Jun Ho Jeon),박수청(Su Chung Park),유동인(Dong In Yu),김태훈(Tae Hun Kim),이연원(Yeon Won Lee) 한국가시화정보학회 2020 한국가시화정보학회지 Vol.18 No.3
In this study, a single-phase analysis of droplet slug with different contact angles was performed based on the visualization of experimental results. Droplet slug – flowing between gases in a hydrophobic mini channel – moves with a triple contact line without a gas liquid film on the wall. The results show that the rotational flow inside the droplet occurred; this was compared and verified with the results of two-phase analysis. The pressure field shows pressure rise at the front and rear ends. The effective length – the section that satisfies the laminar flow condition – became shorter as the droplet velocity increased. The Choi’s correlation for the effective length agrees with this analysis results with a slight difference. This difference is judged as the difference in the contact angle of the slug model.