The near-wall region of zero-pressure gradient turbulent boundary layers was studied
through correlation-and other two-point measurements over a wide range of Reynolds
numbers. The requirements of high spatial resolution were met by use of a MEMS-type of hot-
film sensor array together with a small, in-house built hot-wire probe. Streak-spacing and
characteristics of buffer region shear-layer events were studied. At high Reynolds numbers
the motions that are of substantially larger scale than the streaks have a significant influence …