Experimental study of Taylor's hypothesis in a turbulent soap film

Details Experimental study of Taylor's hypothesis in a turbulent soap film Experimental study of Taylor's hypothesis in a turbulent soap film

1999-05-27

arxiv.org/abs/physics/9905055v2

Physics

Fluid Dynamics

27 pages, + 19 figures

Scientific paper

10.1063/1.870339

An experimental study of Taylor's hypothesis in a quasi-two-dimensional turbulent soap film is presented. A two probe laser Doppler velocimeter enables a non-intrusive simultaneous measurement of the velocity at spatially separated points. The breakdown of Taylor's hypothesis is quantified using the cross correlation between two points displaced in both space and time; correlation is better than 90% for scales less than the integral scale. A quantitative study of the decorrelation beyond the integral scale is presented, including an analysis of the failure of Taylor's hypothesis using techniques from predictability studies of turbulent flows. Our results are compared with similar studies of 3D turbulence.

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