Pulsating pipe flow instability perturbed by a trip wire

Q. H. Nguyen, J. J. Miau, Y. H. Lai, R. Josula

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摘要

This study is concerned with the phenomenon of flow instability in the entrance region of a pulsating pipe flow perturbed by a trip wire at the inlet, where the flow was uniform at the core with a thin boundary layer on the wall. First of all, it is illustrated by a case without the installation of a trip wire that small disturbance developed in the accelerating phase of pulsation, which was well explained by the inflection-point instability mechanism. Subsequently, one of the cases studied with the installation of a trip wire indicates that the inflection-point instability mechanism still played the key role, but the instability was promoted further upstream. On the other hand, there were cases of which the flow instability development was rather due to the viscous effect mainly, which was decaying in a certain downstream region, followed by a renewal growth with irregular fluctuations.

原文English
文章編號109869
期刊Experimental Thermal and Fluid Science
109
DOIs
出版狀態Published - 2019 十二月

All Science Journal Classification (ASJC) codes

  • 化學工程 (全部)
  • 核能與工程
  • 航空工程
  • 機械工業
  • 流體流動和轉移過程

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