Researchers have developed a theory suggesting the existence of quantum viscosity in superfluids, potentially bridging classical and quantum hydrodynamics. This novel approach, which involves analyzing the fall of a sphere in a superfluid, seeks to validate the Reynolds similitude in a quantum context, challenging long-held beliefs in fluid dynamics. Credit: SciTechDaily.com (Upper) Drag is zero without quantum vortices at T = 0. (Lower) Coarse-grained quantum vortices can reproduce the prediction of the Reynolds similitude by forming a turbulent wake with high Reynolds number defined with the quantum viscosity. The inset represents a microscopic view of quantum vortices in the turbulent wake. Credit: Hiromitsu Takeuchi, Osaka Metropolitan University
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