Secondary Flow Phenomena in Rotating Radial Straight Pipes

K. C. Cheng, Liqiu Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)


Flow visualization results for secondary flow phenomena near the exit of a rotating radial-axis straight pipe (length € = 82 cm, inside diameter d = 3.81 cm, €/d = 21.52) are presented to study the stabilizing (relaminarization) and destabilizing (early transition from laminar to turbulent flow) effects of Coriolis forces for Reynolds numbers Re = 500 ~ 4,500 and rotating speeds η = 0 ~ 200 rpm. The flow visualization was realised by smoke injection method. The main features of the transition phenomena are disclosed for Re = 1,500 and 4,500. The observed secondary flow patterns are found to be quite different from those obtained by theoretical or numerical analysis with one pair of symmetric and steady counter-rotating vortices. The practical implications of the visualization study are pointed out.

Original languageEnglish
Pages (from-to)103-111
Number of pages9
JournalInternational Journal of Rotating Machinery
Issue number2
Publication statusPublished - 1995
Externally publishedYes


  • Rotating radial pipes
  • Transition flow
  • Visualization

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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