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The growth characteristics of trailing vortex wakes are investigated in a towing tank. The wakes from a lifting rectangular NACA 0012 airfoil with an aspect ratio of 8 are studied up to 1400 chords downstream. The circulation Reynolds number ranged from 4 x 10 3 to 4 x 10 4 . Digital particle image velocimetry is used to measure the velocity field in the cross-stream plane from which vorticity is calculated. The vortex pair is observed to be very stable and long-lived, showing little decay in the circulation of the individual vortices. The vorticity, however, diffuses over time within the cores of the vortices.
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Jacob et al. (1997) studied this question.
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