Abstract： We investigate the characteristics of the transition from laminar to turbulent flow in the microtube with a diameter of 310μm. 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.
HAO Peng-Fei;YAO Zhao-Hui;HE Feng;ZHU Ke-Qin. Experimental Study on Transitional Flow in a Circular Microtube[J]. 中国物理快报, 2006, 23(10): 2815-2818.
HAO Peng-Fei, YAO Zhao-Hui, HE Feng, ZHU Ke-Qin. Experimental Study on Transitional Flow in a Circular Microtube. Chin. Phys. Lett., 2006, 23(10): 2815-2818.
2006, Vol. 23 
