Bulletin of the American Physical Society
66th Annual Meeting of the APS Division of Fluid Dynamics
Volume 58, Number 18
Sunday–Tuesday, November 24–26, 2013; Pittsburgh, Pennsylvania
Session E11: Bubbles III: Soap, Films and Foams |
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Chair: Kevin Connington, City College of New York Room: 335 |
Sunday, November 24, 2013 4:45PM - 4:58PM |
E11.00001: How are soap bubbles blown? Fluid dynamics of soap bubble blowing John Davidson, Lori Lambert, Erica Sherman, Timothy Wei, Sangjin Ryu Soap bubbles are a common interfacial fluid dynamics phenomenon having a long history of delighting not only children and artists but also scientists. In contrast to the dynamics of liquid droplets in gas and gas bubbles in liquid, the dynamics of soap bubbles has not been well documented. This is possibly because studying soap bubbles is more challenging due to there existing two gas-liquid interfaces. Having the thin-film interface seems to alter the characteristics of the bubble/drop creation process since the interface has limiting factors such as thickness. Thus, the main objective of this study is to determine how the thin-film interface differentiates soap bubbles from gas bubbles and liquid drops. To investigate the creation process of soap bubbles, we constructed an experimental model consisting of air jet flow and a soap film, which consistently replicates the conditions that a human produces when blowing soap bubbles, and examined the interaction between the jet and the soap film using the high-speed videography and the particle image velocimetry. [Preview Abstract] |
Sunday, November 24, 2013 4:58PM - 5:11PM |
E11.00002: Coalescence of soap bubbles: petals and fractals Beng Hau Tan, Silvestre Roberto Gonzalez Avila, Claus-Dieter Ohl The coalescence of thin film bubbles, i.e. soap bubbles, is determined by successive ruptures of the two films approaching each other. Ruptures in isolated thin films have been studied experimentally in detail and their dynamics is well understood theoretically; less so for the coalescence of soap bubbles. In this case, the film rupture occurs in very close proximity to a second film. The interaction between one quickly retracting film with a stationary film leads to complex dynamics. High-speed photography of the events occurring on a microscopic scale is conducted. We find that within the first 100 microseconds radially symmetric fingering and fractal structures are created at the rupture site. The first film retraction may induce the rupture of the second film. Later the retracting soap film causes the entrainment of a ring of secondary bubbles and possibly droplets along its circumference. Some first modelling will be presented, too. [Preview Abstract] |
Sunday, November 24, 2013 5:11PM - 5:24PM |
E11.00003: Plastic and Elastic Deformations of Foam Bubbles Driven by Oscillatory Compression Klebert Feitosa, Nicholas Hagans, Christine O'Dea Fluidization of two-dimensional (2D) foam is characterized by rearrangement events known as T1-events where clusters of four bubbles switch neighbors. This research focus on rearrangement events of bubbles in a bubble raft subject to periodic compression by an oscillating boundary. The instantaneous position of the bubbles are tracked from images of the bubble raft captured with a high speed camera. We find that T1-events are reversible for small amplitude oscillations (elastic deformations), but irreversible for large amplitude oscillations (plastic deformations). We also find that T1 events are spatially correlated confirming that such rearrangements leads to local fluidization. [Preview Abstract] |
Sunday, November 24, 2013 5:24PM - 5:37PM |
E11.00004: Crack Propagation Dynamics and Film Instability in Liquid Foams Sascha Hilgenfeldt, Peter Stewart, Stephen Davis Quasi-two-dimensional liquid foams (a single layer of foam bubbles between parallel plates) are model systems for the behavior of solid-state materials, including their flow and failure. Upon introduction of pressurized air, the foam layer was shown to yield and fail in two different ways, analogous to ductile and brittle fracture. The microscopic processes of deformation, plasticity, and loss of cohesion on the bubble scale are accessible in detail to experiment and modeling, using elements of fluid dynamics, stability theory, and surface chemistry. A simplified network model of liquid nodes captures both fracture modes and allows for quantitative assessment of microscopic effects. For the brittle crack propagation, which involves breakage of a succession of thin liquid films, we show that viscosity and Marangoni stresses can play significant roles in determining film instability and thus the time scales of foam failure, with important consequences for practical applications such as metal foam manufacture or oil recovery. [Preview Abstract] |
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