Abstract
The Taylor vortex flow in the plain model with a constant temperature gradient effect was studied by experimental measurement, and the preliminary features of Taylor vortex flow affected by heat transfer process were obtained. This flow field in the plain model was also studied by numerical simulation. The reliability of numerical simulation was verified by comparing the numerical results with the experimental ones. To study the slit wall effect on this flow regime under the same temperature gradient conditions, another three models with different slit numbers (6, 9 and 12) were considered. The vortex pairs were found to have a motion along the axial direction. Because of the existence of the temperature gradient, the axial flow in the annulus gap was enhanced, but the radial velocity near the inner cylinder was found to be weakened. The heat flux generated by the inner cylinder was also compared among different models, and it was found that the heat flux generated by the 6-slit model was increased by 4.5% compared to that of the plain model, and the 12-slit model generated the maximum heat flux, which has the best heat transfer ability.
Highlights
The flow between two concentric cylinders with the inner one rotating or both rotating, calledTaylor-Couette flow, was first studied by Taylor [1]
Based on the investigation of the slit wall effect on Taylor vortex flow and wavy vortex flow [10,11], we studied a constant temperature gradient and slit number effect on Taylor vortex flow, which was rarely studied by numerical simulation, by PIV (TSI INCORPORATED, Shoreview, MN, USA) measurements and numerical simulation
By comparing this results with that seen under isothermal conditions, it was found the Taylor vortex flow appears at this Re number and the vortices in the annulus gap had the same size, which rotated around a fixed center located in the middle of the annulus gap
Summary
The flow between two concentric cylinders with the inner one rotating or both rotating, called. Kang et al [5] studied the temperature gradient effect on the circular-Couette flow, and found the vortex size increased as the Richardson number increased. Studies of a Taylor-Couette flow considering the effect of the cylinder wall geometry are necessary. Liu et al [8,9] studied the slit wall and temperature gradient effect on the flow transition process in Taylor-Couette flow, and found the transition process in the models with a larger number of slits (9-, 18-slit models) was accelerated due to the slit wall. By comparing the results of four different models, the characteristics of the vortex flow in the annulus gap and the slit number effect on the heat transfer process were obtained
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