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The diffusion-driven growth of a foam ball is a phenomenon that appears inmany manufacturing process as well as in a variety of geological phenomena.Usually these processes are greatly affected by gravity, as foam is muchlighter than the surrounding liquid. However, the growth of the foam free ofgravity effects is still very relevant, as it is connected to manufacturing inspace and to the forma- tion of rocks in meteorites and other small celestialbodies. The aim of this research is to investigate experimentally the growth ofa bubble cloud growing in a gas-supersaturated liquid in microgravityconditions. Here, we describe the ex- periments carried out in the drop towerof the Center of Ap- plied Space Technology and Microgravity (ZARM). In fewwords, a foam seed is formed with spark-induced cavitation in carbonated water,whose time evolution is recorded with two high-speed cameras. Our preliminaryresults shed some light on how the size of the foam ball scales with time, inparticular at times much longer than what could be studied in normalconditions, i.e. on the surface of the Earth, where the dynamics of the foam isalready dominated by gravity after several milliseconds.

Drop tower setup to study the diffusion-driven growth of a foam ball in supersaturated liquids in microgravity conditions