Visualization of low Reynolds boundary-driven cavity flows in thin liquid shells |
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Authors: | Josué?Sznitman Thomas?R?sgen |
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Institution: | (1) Institute of Fluid Dynamics, ETH Zurich, 8092 Zurich, Switzerland;(2) Present address: Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA |
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Abstract: | Abstract Classic examples of low-Reynolds recirculating cavity flows are typically generated from lid-driven boundary motion at a solid–fluid
interface, or alternatively may result from shear flow over cavity openings. Here, we are interested in an original family
of boundary-driven cavity flows occurring, in contrast to classic setups, at fluid–fluid interfaces. Particle image velocimetry
(PIV) is used to investigate the structure of internal convective flows observed in thin liquid shells. Under the specific
configuration investigated, the soap bubble’s liquid shell is in fact in motion and exhibits sporadic local “bursts”. These
bursts induce transient flow motion within the cavity of order Re ∼ O(1). The combination of PIV and proper orthogonal decomposition (POD) is used to extract dominant flow structures present
within bubble cavities. Next, we show that thermally induced Marangoni flows in the liquid shell can lead to forced, (quasi)
steady-state, internal recirculating flows. The present findings illustrate a novel example of low-Reynolds boundary-driven
cavity flows. |
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