Transition to turbulence in starting pipe flows.

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概要

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• An experimental investigation was performed to study the transition to turbulence in pipe flow started impulsively with a supercritical Reynolds number. The results show that a turbulentnon-turbulent interface propagates downstream by consuming the non-turbulent region where laminar boundary-layer flow is developing with time. For the startup of a completely quieted fluid, the propagation velocity is equal to the maximum velocity of the steady-state turbulent flow. For restarting the fluid flow after a brief shutoff, however, the propagation velocity is larger than the maximum velocity, and the difference increases with shorter quieting times. In the process of interface propagation, a wave of very low frequency appears ahead of the interface centring around the radial position where the smallest change in velocity is observed at the instant of propagation. A study of the mechanism of interface propagation shows that the final break of the abovementioned wave continuously triggers downstream propagation of the turbulent-flow region. In addition, random jumping of the interface in turbulence-decaying flow is concluded to be the main cause for the increase in propagation velocity for short quieting times.

• 公益社団法人 化学工学会の論文

著者

• Maruyama Toshiro

  Department Of Chemical Engineering Faculty Of Engineering Kyoto University

• Mizushina Tokuro

  Department Of Chemical Engineering Kyoto University

• Kato Yoshiei

  Department Of Material And Energy Science Graduate School Of Environmental Science Okayama University

• KATO YOSHIEI

  Department of Chemical Engineering, Kyoto University

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