The objective of this paper is to provide a state-of-art review in the field of single-phase pressure drop (friction factor) measurements in micro-tubes. Twenty-three experiments from 1991 to 2006 are reviewed critically in areas of different measurement techniques, instrumentation used and the various data-reduction methods employed. The review confirms that researchers unanimously agree that friction factor in micro-tubes can be predicted by using macro-scale theory and that there is a need to investigate certain issues like (a) the effect of roughness on friction factor and transition and (b) the effect of micro-tube diameter on transition Reynolds number. The state-of-art review thus provides the contemporary experimenters in the field of mini-micro channel fluid flow this vast amount of tabulated data on experimental set-up, results, instrumentation and uncertainties for all twenty-three experiments. The data can be used to investigate how the different parameters affect the fluid flow in these small scales and to validate future numerical and experimental work. Moreover, the review observes that smooth micro-tubes follow classical laws while roughness does seem to play a major role in the dynamics of smaller diameter tubes.

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