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Laminar-turbulent transitions occur at different Reynolds numbers fordifferent flow configurations and different fluids. In order to studyquantitatively the similarity among the transition processes of wall-boundedshear flows, a uniform definition of transition parameter is required. Thetransition parameters defined with properties of fluid element are compared anddiscussed in terms of theoretical basis, physical definition, and expression,and their application limitations in plane-Poiseuille flow, plane-Couette flow,and Hagen-Poiseuille flow are clarified.

A note on transition parameters defined with properties of fluid element