Transition from laminar to turbulent flow in liquid filled microtubes

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Viscous flow through microfabricated hyperbolic contractions (2007, background): “A large number of investigations have been undertaken to understand the fundamentals of fluid flow through microfluidic devices (see for example Sharp and Adrian 2004; Stone et al. 2004; Squires and Quake 2005 and references therein).”
History, Advances, and Challenges in Liquid Flow and Flow Boiling Heat Transfer in Microchannels: A Critical Review (2012, background): “In 2004, Sharp and Adrian [47] confirmed that the transition to turbulent flow occurs at approximately the same Reynolds numbers as in macroscale tubes.”
Fluid flow in micro-channels (2005, methodology): “During the last few years better methods have been used for measurement of the mean velocity, as well as rms of the velocity fluctuations [20,14].”
Supercritical microfluidics: Opportunities in flow-through chemistry and materials science (2012, background): “epending on the flow scale and more importantly on the flow eometry and the roughness of the microchannels surface, authors eported L–T transition for Reynolds numbers ranging from 400 o 2000 [91–95].”
Experimental study of compressibility, roughness and rarefaction influences on microchannel flow (2007, methodology): “Sharp and Adrian [30] performed experiments for circular glass microtubes with diameters ranging from 50 to 247 lm.”