[논문]상승하는 원환형 기포와 자유수면의 상호작용

문은성; 김대겸

doi:10.5407/jksv.2022.20.2.055

상승하는 원환형 기포와 자유수면의 상호작용
Interaction between a rising toroidal bubble and a free surface 원문보기

한국가시화정보학회지= Journal of the Korean society of visualization, v.20 no.2, 2022년, pp.55 - 62

문은성 (Mechanical Engineering, KAIST) , 김대겸 (Mechanical Engineering, KAIST)

Abstract ▼ AI-Helper

We experimentally investigate a rising toroidal bubble impacting a free surface. The toroidal bubble is created by releasing pulsed air. By adjusting the volume and circulation of the toroidal bubble, the characteristics of interactions between the toroidal bubble and the free surface are identified. Because of the impact by the toroidal bubble, the free surface is convexly deformed upwards above the center point of the toroidal bubble, while the edge of the deformed free surface is pulled down. When the circulation of the bubble becomes stronger, the surface which was pulled down breaks eventually, and air above the free surface is entrained into water, forming an unstable toroidal bubble. The deformations at the center and edge of the free surface are in a linear relationship with the Froude number and the Weber number, respectively.

주제어

표/그림 (9)

그림 Fig. 1. Experimental setup.
그림 Fig. 2. Kinematic parameters of a toroidal bubble.
그림 Fig. 3. Representative scenes of the interaction between a toroidal bubble and free surface. Bo = 63, Fr = 0.8, We = 24.
그림 Fig. 4. (a) Dimensionless vertical position and (b) dimensionless ring radius of the toroidal bubble displayed in Fig. 3.
그림 Fig. 5. (a) Deformation of the free surface and (b) 2-D schematic diagram of the free surface deformation.
그림 Fig. 6. Dimensionless maximum deformed height of the free surface, z_max/R₀, with respect to (a) Fr² and (b) Bo.
그림 Fig. 7. Sequence of free surface break for Bo = 86, Fr = 1.1, We = 42.
그림 Fig. 8. Dimensionless positions of the lowermost point of the deformed surface, z_min/R₀, and the entrained bubble, z_bubble/R₀, with respect to We. The dotted line denotes We = 40.
그림 Fig. 9. Different regimes of free surface deformation. The circular black markers represent no air entrainment cases, and the red diamond markers represent air entrainment cases.

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