Abstract
Turbulent stripe, which occurred in a turbulent channel flow at the transitional Reynolds number, was studied experimentally by flow visualization. Our flow visualization was achieved by seeding the flow with reflective flakes. For the bulk mean Reynolds number Rem= 1700 ~ 2000, the turbulent stripe was observed to be inclined at angles of 20o~30o against the streamwise direction, and its streamwise wavelength was about 60 times of the channel half width (δ). The longitudinal streaks with the spanwise spacing of 1.6δ were found in the quasi-laminar regions. The critical Reynolds number was Rem = 1300. Streamwise velocity was measured by laser Doppler velocimetry, revealing similarity to the equilibrium turbulent puff in a transitional pipe flow.
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