DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Cho, Yeunwoo | - |
dc.contributor.advisor | 조연우 | - |
dc.contributor.author | Kang, Youn Joung | - |
dc.date.accessioned | 2021-05-12T19:39:47Z | - |
dc.date.available | 2021-05-12T19:39:47Z | - |
dc.date.issued | 2020 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=909342&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/284133 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 기계공학과, 2020.2,[v, 55 p. :] | - |
dc.description.abstract | Jet-like surface waves generated by an electric-spark-generated underwater bubble are experimentally studied. Three different motions of jet-like surface waves are observed depending on the inception position of the bubble (d: 0.28–7 mm) below the free surface and the maximum radius of the bubble ($R_m$: 1.5–3.6 mm). When d/$R_m$>1.3, the surface wave shows a simple smooth hump (case 1). When 0.7 < d/$R_m$ < 1.3, a single droplet or multiple droplets are pinched off at the jet-like surface wave (case 2). Finally, when d/$R_m$<0.7, a series of squirting & jetting phenomena are observed (case 3). For the cases 1, a proportional relationship is found between $\rho$gh/$\Delta p$ and $(d/R_m)^{-4}$, where $\rho$ is the density of the fluid, g is the gravitational acceleration, h is the maximum height of the surface wave and $\Delta p$ is the difference between the reference atmospheric pressure and the pressure inside a bubble. This proportional relationship is shown semi-analytically using a scaling argument, conservation of mass, momentum, and energy with the help of the Kelvin impulse theory. In addition, it is found that the resultant surface waves are indeed gravity-capillary waves by comparing the analytical wave solution with the observed surface wave pattern. For the case 2, the discretely proportional relationship between h/$R_m$ and the number of pinched off droplets (n) is observed through the experiment and analysed semi-analytically using a scaling argument and geometrically using conservation of mass. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | surface wave▼agravity-capillary waves▼aunderwater bubble | - |
dc.subject | 수면파▼a중력-표면장력 파▼a수중 버블 | - |
dc.title | Experimental study on the bubble-induced gravity-capillary jet-like surface waves | - |
dc.title.alternative | 버블 유도 중력-표면장력 제트 형 표면파에 관한 실험적 연구 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :기계공학과, | - |
dc.contributor.alternativeauthor | 강윤정 | - |
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