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with a cross-section measuring 320 lm · 330 lm for Reynolds numbers between 272 and 2853. Care was taken to ensure that the
seed particle density was great enough that accurate instantaneous velocity vector ï¬ elds could be obtained for all the Reynolds numbers
investigated. Velocity fl uctuations were calculated from ensembles of microPIV velocity ï¬ elds. The hu0i / umax fl uctuation showed
an increase at Re = 1535 and a further increase as Reynolds numbers were increased, suggesting that transition to turbulence began
near Re = 1535, a Reynolds number lower than predicted by classical theory. The hu0i / umax data also suggest the fl ow was fullydeveloped
at a Reynolds number between 2630 and 2853, also lower than classical results. This ï¬ nding was con ï¬ rmed in plots of
the mean velocity pro ï¬ le. For the fully developed fl ow, the measured hu0 i / umax fl uctuation agreed well with classical results for turbulent
duct fl ow, but the hv0 i / umax fl uctuation was 25–40% lower than turbulent duct fl ow results. Finally, spatial correlations of
velocity fl uctuations were calculated to lend some insights into the characteristics of the large-scale turbulent structures observed
in the turbulent microchannel fl ow.
Microscopic particle image velocimetry (microPIV) experiments were performed on a polydimethylsiloxane (PDMS) microchannel