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The Merger of a Bubble and a Soap Film

The merger of a bubble and a soap film Daniel M. Harris, Department of Mathematics, Massachusetts Institute of Technology Giuseppe Pucci, Department of Mathematics, Massachusetts Institute of Technology Victor Prost, Department of Mathematics, Massachusetts Institute of Technology Julio Quintela Casal, Department of Mathematics, Massachusetts Institute of Technology John W. M. Bush, Department of Mathematics, Massachusetts Institute of Technology DOI: http://dx.doi.org/10.1103/APS.DFD.201... We present the results of an experimental investigation of the merger of a soap bubble with a planar soap film. When gently deposited onto a horizontal film, a bubble may interact with the underlying film in such a way as to decrease in size, leaving behind a smaller daughter bubble with approximately half the radius of its progenitor. The process repeats up to three times, with each partial coalescence event occurring over a time scale comparable to the inertial-capillary time. Our results are compared to the coalescence cascade of droplets on a fluid bath. Selected as a 2015 APS/DFD Milton van Dyke Award Winner. See other videos from the 2015 Gallery of Fluid Motion: http://gfm.aps.org/