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Investigation of turbulent flow field in a Kenics static mixer by Laser Doppler Anemometry

  • Halina Murasiewicz EMAIL logo and Zdzislaw Jaworski
Published/Copyright: May 28, 2013
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Chemical Papers
From the journal Chemical Papers Volume 67 Issue 9

Abstract

The main purpose of the present paper was to apply the Laser Doppler Anemometry (LDA) technique to measure turbulent liquid flow in a Kenics static mixer. The LDA set-up was a one-channel backscatter system with argon-ion laser. Measurements in the static mixer were carried out for three values of the Reynolds number: 5000, 10000, and 18000. Water was used as the process liquid. Values of the axial and tangential components of the local, mean, and root mean square velocities were measured inside the static mixer. It was observed that the shape of the velocity profile depends strongly on the Reynolds number, Re, as well as on the axial, h, and radial, α, position of the measurement point. Strong dependence of the velocity fluctuations on the Reynolds number was found in the investigated range of Re and the measurement point position. Furthermore, one-dimensional energy spectra of the velocity fluctuations were also obtained by means of the Fast Fourier Transform. Fluctuation spectra of the axial and tangential velocities provided information about the energy density of velocity fluctuations in the observed range of Reynolds numbers. A study of the energy spectra led to the conclusion that the energy density increases with the increasing radial distance from the mixer walls at constant values of h, Re, and α. Minor variations in the mean value of the energy density, E, were observed together with variations of the measurement point angular position, α. In addition, it was observed that an increase of the Reynolds number causes significant increase of the power spectral density.

Keywords: LDA; static mixer; turbulent flow; one-dimensional energy spectra

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Published Online: 2013-5-28
Published in Print: 2013-9-1

© 2013 Institute of Chemistry, Slovak Academy of Sciences

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https://doi.org/10.2478/s11696-013-0375-z
Keywords for this article
LDA; static mixer; turbulent flow; one-dimensional energy spectra

Articles in the same Issue

  1. Evaluation of waste products in the synthesis of surfactants by yeasts
  2. Investigation of CO2 and ethylethanolamine reaction kinetics in aqueous solutions using the stopped-flow technique
  3. Alkali pre-treatment of Sorghum Moench for biogas production
  4. Modelling of kinetics of microbial degradation of simulated leachate from tobacco dust waste
  5. Model predictive control-based robust stabilization of a chemical reactor
  6. Decomposition of meta- and para-phenylphenol during ozonation process
  7. Treatment of effluents from a membrane bioreactor by nanofiltration using tubular membranes
  8. Zeolite and potting soil sorption of CO2 and NH3 evolved during co-composting of grape and tobacco waste
  9. Liquid-solid equilibrium for the NaCl-NaHCO3-Na2CO3-H2O system at 45°C. Validation of mixed solvent electrolyte model
  10. Investigation of turbulent flow field in a Kenics static mixer by Laser Doppler Anemometry
  11. Effect of flow-rate on ethanol separation in membrane distillation process
  12. Preparation of aluminium ammonium calcium phosphates using microwave radiation
  13. Continuous dehydrochlorination of 1,3-dichloropropan-2-ol to epichlorohydrin: process parameters and by-products formation
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