Abstract
The wavy vortex flow in the plain model was studied by experimental measurement; the preliminary feature of wavy vortex flow was obtained. This flow field in the plain model was also studied by numerical simulation. The reliability of numerical simulation was verified by comparing with the experimental and numerical simulation results. To study the slit wall effect on the wavy vortex flow regime, another two models with different slit number were considered; the slit number was 6 and 12. By comparing the wavy vortex flow field in different models, the axial fluctuation of Taylor vortices was found to be different, which was increased with the increasing of slit number. The maximum radial velocity from the inner cylinder to the outer one in the 6-slit number was increased by 12.7% compared to that of plain model. From the results of different circumferential position in the same slit model, it can be found that the maximum radial velocity in slit plane is significantly greater than that in other planes. The size of Taylor vortices in different models was also calculated, which was found to be increased in the 6-slit model but was not changed as the slit number increased further.
Highlights
The flow between two concentric cylinders, with the inner one rotating or both rotating, is called Taylor-Couette flow, which has been first studied by Taylor [1]
Yang and Lin [3] studied the Taylor-Couette flow transition process by flow visualization method; the aluminum particles were added to investigate the stability of flow field, they found as the rotation speed increased, the aluminum particles have the axial motion before the transition to Taylor vortex flow
Kadar and Balan [5] studied the aspect ratio effect on the transition process of TaylorCouette flow; this study focused on the wavy vortex flow, and they found that after the transition to wavy vortex flow, as the Reynolds number is larger than the critical value, Taylor vortex flow can be found, which means the transition process in unstable
Summary
The flow between two concentric cylinders, with the inner one rotating or both rotating, is called Taylor-Couette flow, which has been first studied by Taylor [1]. Yang and Lin [3] studied the Taylor-Couette flow transition process by flow visualization method; the aluminum particles were added to investigate the stability of flow field, they found as the rotation speed increased, the aluminum particles have the axial motion before the transition to Taylor vortex flow. Wereley and Lueptow [6] studied the spatiotemporal character of wavy vortex flow and found that the axial motion of the vortex centers decreases with increasing Reynolds number. Xiao et al [7] studied the acceleration effect on the wavy vortex flow and found the wave speed and wavelength before them asymptote to a constant value, which is a function of the acceleration
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