Experiments in Fluids

, 60:61 | Cite as

Experimental investigation of mixing efficiency in particle-laden Taylor–Couette flows

  • Zeinab Rida
  • Sébastien Cazin
  • Fabrice Lamadie
  • Diane Dherbécourt
  • Sophie Charton
  • Eric ClimentEmail author
Research Article


This paper reports on original experimental data of mixing in two-phase Taylor–Couette flows. Neutrally buoyant particles with increasing volume concentration enhance significantly mixing of a passive tracer injected within the gap between two concentric cylinders. Mixing efficiency is measured by planar laser-induced fluorescence coupled to particle image velocimetry to detect the Taylor vortices. To achieve reliable experimental data, index matching of both phases is used together with a second PLIF channel. From this second PLIF measurements, dynamic masks of the particle positions in the laser sheet are determined and used to calculate accurately the segregation index of the tracer concentration. Experimental techniques have been thoroughly validated through calibration and robustness tests. Three particle sizes were considered, in two different flow regimes to emphasize their specific roles on the mixing dynamics.

List of symbols



Area of pixels with value 1 (–)


Concentration (–)


Mean concentration (–)


Gap width (m)


Height (m)


Segregation index (u.a.)


Azimuthal wavenumber (–)


Refraction index (–)


Initial decay rate (–)


Stator radius (m)


Rotor radius (m)

\(Re_{\varOmega }\)

Reynolds number (–)


Radial coordinate (m)


Rotational period (s)

\(t_{1/2}\), \(t_{90}\), \(t_{99}\)

Mixing times (s)

\({\varGamma }= H/e\)

Aspect ratio (–)

\({\varGamma }\)

Mean shear rate (\({\text{s}}^{-1}\))


Axial wavelength (–)


Kinematic viscosity (\({\text{m}}^2\,{\text{s}}^{-1}\))

\({\varOmega }\)

Rotation rate (\(\text{rad}\,\text{s}^{-1}\))


Density (\(\text{kg}\,\text{m}^{-3}\))


Standard deviation (–)

\(\sigma ^2\)

Variance (–)





Thiocyanate of potassium


Particle image velocimetry


Planar laser-induced fluorescence


Camera (scientific complementary metal oxide semi-conductor)


Spiral vortex flow


Taylor vortex flow


Wavy vortex flow





Relative to the rotor


Relative to the stator


Relative to the origin value


In the vertical visualization plane



The authors would like to thank CEA for financial support and the technical support of Moise Marchal (IMFT) and Hervé Roussel (CEA).


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Zeinab Rida
    • 1
  • Sébastien Cazin
    • 1
  • Fabrice Lamadie
    • 2
  • Diane Dherbécourt
    • 2
  • Sophie Charton
    • 2
  • Eric Climent
    • 1
    Email author
  1. 1.Institut de Mécanique des Fluides de Toulouse (IMFT)Université de Toulouse, CNRSToulouseFrance
  2. 2.CEA, DEN, MAR, DMRC, SA2IBagnols-sur-Cèze CedexFrance

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