Occurrence of turbulent bursts in an oscillatory pipe flow
Abstract
A detailed examination of an oscillating flowfield in a pipe was performed in order to characterize flow conditions which exist preceding the onset of turbulent bursts in terms of Reynolds numbers based on combinations of internal and external variables. Transient laminar theory was used to calculate the critical Reynolds number by assuming that the crosssectional velocity in an oscillatory flow is known a priori. The axial velocity component and the wall shear stress were then defined and a finite Fourier expansion was employed to approximate the measured mean velocity and tracings on oscillograph paper were used to detect the moment of onset of turbulent bursts. The critical Reynolds number was found to lie between 100,000 and 2300 when the mean velocity increases with time.
 Publication:

Osaka University Technology Reports
 Pub Date:
 March 1982
 Bibcode:
 1982OsUTR..32..113O
 Keywords:

 Computational Fluid Dynamics;
 Flow Velocity;
 Oscillating Flow;
 Pipe Flow;
 Reynolds Number;
 Turbulent Flow;
 Flow Characteristics;
 Flow Distribution;
 Flow Theory;
 Laminar Flow;
 Shear Stress;
 Wall Flow;
 Fluid Mechanics and Heat Transfer