Secondary Flow Phenomena in Rotating Radial Straight Pipes

Article English OPEN
Cheng, K. C. ; Wang, Liqiu (1995)
  • Publisher: Hindawi Publishing Corporation
  • Journal: International Journal of Rotating Machinery (issn: 1023-621X)
  • Related identifiers: doi: 10.1155/S1023621X9500025X
  • Subject: TA1-2040 | Visualization | Transition flow. | Rotating radial pipes | Engineering (General). Civil engineering (General)
    arxiv: Physics::Fluid Dynamics

Flow visualization results for secondary flow phenomena near the exit of a rotating radial-axis straight pipe (length ࡁ = 82 cm, inside diameter d = 3.81 cm, ࡁ/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 n = 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.
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