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Additional experimental studies of the structure of Reynolds stress which supplement our previous work (Willmarth the excess percentage over 100% is due to the other small negative contributions. Characteristic mean time intervals are obtained for both bursts and sweeps from certain unique features of the measurements of fractional contributions to uv from different events. Both mean time intervals are approximately equal and constant for most of the turbulent boundary layer. The scaling of the mean time interval between bursts with outer flow variables is confirmed. It is suggested that many of the features of the fluctuating flow revealed by the measurements may be explained by convection past the measuring station of an evolving deterministic flow pattern such as the hairpin vorticity model of Willmarth & Tu (1967).
Lu et al. (Tue,) studied this question.
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