Visualization of flow patterns in axial flow between horizontal coaxial rotating cylinders

Abstract

The structure of Taylor vortices in the annulus of coaxial horizontal rotating cylinders with and without axial flow was studied by a flow visualization technique based on the colour change of analytical indicators. Flow interaction effects can be characterized by three parameters whose numerical values are obtained from photographs and super 8 mm film strips.

Axial dispersion in Taylor‐Couette flow

“…The experiments with tracers of different diffusivities were performed at low axial Reynolds number of 0.6 and with a wide gap geometry of b/ri = 0.4 where laminar vortices are known to exist (Gu and Fahidy, 1985). If the vortex cells are truly laminar and nonoverlapping, transport between cells can only occur by diffusion across the separatrix between the vortices.…”

Facile synthesis of graphene oxide in a Couette–Taylor flow reactor

“…As shown in Fig. 1a, the Couette-Taylor reactor consists of two concentric cylinders and the inner cylinder rotates at a controlled speed while the outer cylinder is kept stationary [28][29][30]. Then, a mixture of graphite flakes, the concentrated acids and oxidizing agents were fed into the reactor.…”

“…The Couette-Taylor vortex can be formed when the Taylor number proportional to the angular velocity of the inner cylinder exceeds a critical value [28][29][30]. In this sense, we first carried out the oxidation of graphite in the reactor with increasing rotating speeds from 400 to 1200 rpm for the reaction time of 60 min.…”

“…The Couette-Taylor reactor consists of two coaxial cylinders with the inner one rotating. At a critical rotating speed, toroidal vortices are created and regularly spaced along the cylinder axis [28][29][30]. We found that this toroidal motion of fluids leads to highly efficient radial mixing of graphite and oxidizing agents in the system, thereby enhancing the oxidation efficiency.…”

Feasible water flow filter with facilely functionalized Fe3O4-non-oxidative graphene/CNT composites for arsenic removal

“…We found that the toroidal motion of the fluids created in the Couette-Taylor reactor leads to highly efficient radial mixing between the Fe3O4 and the CNTs and/or the non-oxidative graphene in the system [36][37][38].…”