A study of fullydeveloped, laminar, axial flow and Taylor vortex flow by means of shear stress measurements
Abstract
Results of a shearstress investigation are presented for combined axial and rotational flow under conditions of both laminar flow and laminar flow plus Taylor vortices. These results show that two distinct regimes of shearstress dependency exist. In the primary regime the shear stress is constant and depends only on the imposed axial flow, the flow being either laminar (Poiseuille and Couette flows) or laminar with vortices, but with the effect of the vortices being negligible. In the secondary regime, the shear stress is shown to depend only on Taylor number to the 0.735 power, irrespective of the imposed axial flow. At low axialflow rates, a tertiary regime was observed, but no satisfactory explanation can be found for this phenomenon. The demarcation between the primary and secondary flow regimes differs markedly from those of other investigators. Critical conditions are determined by the point at which vortices begin to have an effect on measurements taken at the outer annular wall rather than the conditions under which vortices are initially formed.
 Publication:

Journal of Mechanical and Engineering Science
 Pub Date:
 February 1979
 Bibcode:
 1979JMecE..21...19C
 Keywords:

 Axial Flow;
 Flow Measurement;
 Fluid Flow;
 Laminar Flow;
 Shear Stress;
 Taylor Instability;
 Convective Heat Transfer;
 NavierStokes Equation;
 Reynolds Number;
 Rotating Fluids;
 Vortices;
 Fluid Mechanics and Heat Transfer