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Experimental Study on Transitional Flow in a Circular Microtube

Hao Peng-Fei, Yao Zhao-Hui, He Feng and Zhu Ke-Qin

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We investigate the characteristics of the transition from laminar to turbulent flow in the microtube with a diameter of 310 μm. The microscopic particle image velocimetry is used to measure the water flow at Re=1600–2500 in the microtube. It is found that the flow transition occurs at Re=1600–1900, and the streamwise streaks and vortices appear in the transitional flow fields. These experimental observations provide a validation for the theoretical prediction of unstable travelling waves in pipe flow.


PACS

47.27.Cn Transition to turbulence

47.80.Cb Velocity measurements

47.80.Jk Flow visualization and imaging

Subjects

Fluid dynamics

Instrumentation and measurement

Dates

Issue 10 (October 2006)

Received 11 May 2006



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