Journal of the Japanese Society for Experimental Mechanics
Print ISSN : 1346-4930
ISSN-L : 1346-4930
Orijinal Papers
Transition to Turbulence in Transient Circular Pipe Flow Started from Steady Laminar State
Kazuyoshi NISHIHARAYusei NOHASHIYoshiaki UEDAYasushi SASAKIManabu IGUCHI
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2010 Volume 10 Issue 4 Pages 425-432

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Abstract
Air is accelerated from the state of rest, steady laminar state, or steady transitional state in a circular pipe at a constant-acceleration until it reaches a predetermined cross-sectional mean velocity. The effects of the history of transient flow thus generated on the transition to turbulence and the axial propagation velocity of turbulence are investigated. The transitional Reynolds number of the transient flow is hardly affected by the cross-sectional mean velocity of the initial laminar flow. The axial propagation velocity of turbulence is the same magnitude as the value in a steady transitional pipe flow. An analytical solution derived for the axial velocity component of the transient laminar flow is compared favorably with the measured values.
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© 2010 The Japanese Society for Experimental Mechanics
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