Turbulence in a soap film
Turbulent flows over walls experience frictional drag, the property of a flow that sets the cost of pumping oil through a pipeline and the drainage capacity of a river in flood, for example. The existence of a missing link between the frictional drag and the fluctuations or 'eddies' in a flow has been verified through experiments in turbulent soap-film flows such as the one shown in this photograph, which was featured as the cover of Nature Physics in June 2010. (Photograph courtesy of Dr. Tuan Tran.)
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