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Direct vorticity measurement in turbulence

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Vorticity optical probing (VOP) is a direct vorticity measurement technique, which obtains the three-components of vorticity by measuring the rotation of micro-sized particles seeded in turbulent flows. Compared with other conventional vorticity measurement methods, a noticeable advantage of VOP is its high spatial resolution, which is given by the size of the seeding particles (20 μm in our experiments). Equipped with high-speed cameras, VOP can also reach high temporal resolution (down to 50 μs). We outline the principles of VOP and report the first direct measurement of vorticity in high-Reynolds-number turbulent flows.

Author(s):

Huixuan Wu    
Max Planck Institute for Dynamics and Self-Organization (MPIDS)
Germany

Haitao Xu    
Max Planck Institute for Dynamics and Self-Organization (MPIDS)
Germany

Eberhard Bodenschatz    
Max Planck Institute for Dynamics and Self-Organization (MPIDS)
Germany