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Taylor-Couette flow with radial fluid injection.

Nikolas Wilkinson1, Cari S Dutcher2

  • 1Department of Chemical Engineering and Materials Science, University of Minnesota-Twin Cities, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, USA.

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Summary

A new Taylor-Couette cell design enables radial fluid injection, allowing for in situ studies of mixing and multiphase complexation. High injection rates sustained changes to turbulent vortex structures, with potential applications in water treatment.

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Area of Science:

  • Fluid dynamics
  • Chemical engineering
  • Materials science

Background:

  • Taylor-Couette cells offer diverse hydrodynamic flow states beneficial for industrial processes.
  • Traditional designs face limitations in introducing new fluids during operation due to geometric constraints.

Purpose of the Study:

  • To develop and characterize a novel co- and counter-rotating Taylor-Couette cell with radial fluid injection capabilities.
  • To investigate the impact of radial injection on the stability of turbulent Taylor vortex structures.

Main Methods:

  • Construction of a Taylor-Couette cell featuring 16 radial injection ports in the inner cylinder.
  • Simultaneous axial flow capability for large injection volumes.
  • Systematic variation of injection rates and masses to observe effects on vortex dynamics.

Main Results:

  • The new design precisely controls fluid injection without altering critical Reynolds numbers for flow instabilities.
  • Only the highest injection rate (5.9 g/s) and total mass (100 g) resulted in sustained modifications of the turbulent Taylor vortex structure.
  • Lower injection rates or masses led to the rapid recovery of the pre-injection vortex structure.

Conclusions:

  • The developed Taylor-Couette system facilitates in situ studies of hydrodynamic effects on fluid-fluid mixing and multiphase complexation.
  • Demonstrated potential for applications such as studying bentonite flocculation for enhanced water treatment.