지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 신원규
- 발행연도
- 2021
- 저작권
- 충남대학교 논문은 저작권에 의해 보호받습니다.
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초록· 키워드
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Bubbles have many industrial applications. It is important to understand bubble formation process. It is affected by various factors such as bubble generator geometry, physical and chemical properties of liquids, gas or liquid flow rate. There are few studies on the effect of surfactant concentration of liquid on the bubble generation when micro orifices are used.
Thus, in this study, the effect of surfactant concentration on bubbles formation, coalescence, and detachment at micro-orifices using various flow rates is investigated. In the experiment, micro orifices of 50, 100, and 200 μm were used, and the flow rates were adjusted from 0.9 to 50 ccm. Images of bubbles generated from the orifice were taken with a high-speed camera, and image processing was performed using Image J software to measure the size, rising velocity and number of coalescence at de-ionized water and 5, 20 ppm Triton X-100 solution.
As surfactant concentration is increased at all gas flow rates the size of bubbles becomes smaller. And in the range of flow rate larger than critical gas flow rate, the higher surfactant concentration, the smaller ratio of bubble volume to the Frtiz volume. As the orifice becomes smaller, surface tension force decreases and gas momentum force increases. Consequently, the effect of surfactant concentration becomes weaker. In addition, detachment and waiting time of bubble become shorter as the concentration of surfactant increases because bubble coalescence occurs less frequently as surfactant concentration becomes higher.
Thus, in this study, the effect of surfactant concentration on bubbles formation, coalescence, and detachment at micro-orifices using various flow rates is investigated. In the experiment, micro orifices of 50, 100, and 200 μm were used, and the flow rates were adjusted from 0.9 to 50 ccm. Images of bubbles generated from the orifice were taken with a high-speed camera, and image processing was performed using Image J software to measure the size, rising velocity and number of coalescence at de-ionized water and 5, 20 ppm Triton X-100 solution.
As surfactant concentration is increased at all gas flow rates the size of bubbles becomes smaller. And in the range of flow rate larger than critical gas flow rate, the higher surfactant concentration, the smaller ratio of bubble volume to the Frtiz volume. As the orifice becomes smaller, surface tension force decreases and gas momentum force increases. Consequently, the effect of surfactant concentration becomes weaker. In addition, detachment and waiting time of bubble become shorter as the concentration of surfactant increases because bubble coalescence occurs less frequently as surfactant concentration becomes higher.
목차
1. 서론 11.1 연구 배경 및 필요성 11.2 선행 연구 21.3 연구 목적 및 내용 72. 실험 방법 82.1 실험 장치 82.2 이미지 프로세싱 113. 결과 및 고찰 123.1 기포의 성장에 작용하는 힘 123.2 기포의 체적에 대한 계면활성제의 영향 143.3 기포의 성장, 분리 과정의 시간적 특성 254. 결론 42참고 문헌 44Abstract 49
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