Deionized water flows in fused silica microtubes, with nominal diameters of 100, 320, and 1000-μm were studied. Flow conditions produced Reynolds numbers in the range 150 < Re < 11,000. Critical Reynolds number was found to be in the range of 2180 < Recr < 2450 for the three tube sizes. The average Poiseuille number was 76.9 ± 5%. Experimental turbulent data was in excellent agreement with the Colebrook equation. Molecular tagging velocimetry was used to further validate transition; Recr was in agreement with that determined by the integral technique.

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