The aim of this study was to investigate first departures from laminar conditions in both impulsively started and steady pipe entrance flows. Wall shear stress measurements were conducted of transition in impulsively started pipe flows with large disturbances. These results were reconciled in a framework of displacement thickness Reynolds number and a velocity profile shape parameter, with existing measurements of pipe entrance flow instability, pipe-Poiseuille and boundary layer flow responses to large disturbances, and linear stability predictions. Limiting critical Reynolds number variations for each type of flow were thus inferred, corresponding to the small and gross disturbance limits respectively. Consequently, insights have been provided regarding the effect of disturbance levels on the stability of both steady and unsteady pipe flows.
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March 2002
Technical Papers
The Effect of Finite Amplitude Disturbance Magnitude on Departures From Laminar Conditions in Impulsively Started and Steady Pipe Entrance Flows
E. A. Moss, Professor,
E. A. Moss, Professor
School of Mechanical Engineering, University of the Witwatersrand, Johannesburg, Private Bag 3, WITS 2050, South Africa
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A. H. Abbot, Graduate Student
A. H. Abbot, Graduate Student
School of Mechanical Engineering, University of the Witwatersrand, Johannesburg, Private Bag 3, WITS 2050, South Africa
Search for other works by this author on:
E. A. Moss, Professor
School of Mechanical Engineering, University of the Witwatersrand, Johannesburg, Private Bag 3, WITS 2050, South Africa
A. H. Abbot, Graduate Student
School of Mechanical Engineering, University of the Witwatersrand, Johannesburg, Private Bag 3, WITS 2050, South Africa
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division February 16, 1999, revised manuscript received November 7, 2001. Associate Editors: S. Banerjee and J. Katz.
J. Fluids Eng. Mar 2002, 124(1): 235-240 (6 pages)
Published Online: November 7, 2001
Article history
Received:
February 16, 1999
Revised:
November 7, 2001
Citation
Moss, E. A., and Abbot, A. H. (November 7, 2001). "The Effect of Finite Amplitude Disturbance Magnitude on Departures From Laminar Conditions in Impulsively Started and Steady Pipe Entrance Flows ." ASME. J. Fluids Eng. March 2002; 124(1): 235–240. https://doi.org/10.1115/1.1445137
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