Fluctuations of the non-Newtonian fluid flow in a Kenics static mixer: An experimental study

• Authors: Sylwia Peryt-Stawiarska , Zdzisław Jaworski
• Languages of publication: EN

Abstracts

EN

The measurements for a Kenics static mixer were carried out using Laser Doppler Anemometer (LDA). The test fluid was non-Newtonian solution of CMC, Blanose type 9H4. The velocity data inside the 5th Kenics insert were collected for the axial components at five levels of Reynolds number, Re = 20 ÷ 120. Velocity fluctuations were also analyzed in the frequency domain, after processing them with the help of the Fast Fourier Transform (FFT) procedure. The spectra of fluctuations provided information about level of the fluctuations in the observed range of Reynolds number. The obtained data were then also used to plot the velocity profiles for the fifth insert of the Kenics mixer. It was concluded that in the investigated range of Reynolds numbers (Re = 20 ÷ 120) a strong dependence of the velocity profiles and the flow fluctuations on Reynolds number was observed.

Keywords

EN

Flow instabilities; LDA measurements; non-Newtonian fluid; Kenics mixer

• Publisher: De Gruyter Open
• Journal: Polish Journal of Chemical Technology
• Year: 2008
• Volume: 10
• Issue: 3
• Pages: 35-37

Dates

published

1 - 1 - 2008

online

8 - 10 - 2008

Contributors

author

Sylwia Peryt-Stawiarska

• Institute of Chemical Engineering and Environmental Protection Processes, Szczecin University of Technology, al. Piastów 42, 71-065 Szczecin, Poland

author

Zdzisław Jaworski

• Institute of Chemical Engineering and Environmental Protection Processes, Szczecin University of Technology, al. Piastów 42, 71-065 Szczecin, Poland

References

• van Wageningen, W.F.C., Mudde, R.F. & van den Akker, H.E.E., Numerical investigation into mixing of particle-laden flows in a Kenics static mixer, 11th Europ. Conf. on Mixing, Bamberg, Germany, 2003, 137-144.
• Wadley, R. & Dawson, M.K., LIF measurements of blending in static mixers in the turbulent and transitional flow regimes, Chem. Eng. Sci., 2005, 60, 2469-2478. DOI: 10.1016/j.ces.2004.11.021[Crossref]
• Jaffer, A.A., Wood, P.E., Quantification of laminar mixing in the Kenics static mixer: an experimental study, Can. J. Chem. Eng., 1998, 76, 516-521.
• Adamiak, I. & Jaworski, Z., Badania eksperymentalne przepływu cieczy nieniutonowskiej w mieszalniku statycznym typu Kenics, Inż. Chem. i Proc., 2001, 22, 3B, 157.
• Adamiak, I., Badania anemometryczne i modelowanie numeryczne pól prędkości cieczy w mieszalnikach statycznych, PhD Thesis, Szczecin University of Technology, Szczecin 2003.
• Fang, J.Z. & Lee, D.J., Micromixing efficiency in static mixer, Chem. Eng. Sci., 2001, 56, 3797-3802.
• Li, H.Z., Fasol, C. & Choplin, L., Pressure drop of Newtonian and non-Newtonian fluids across a Sulzer SMX static mixer, Trans. IChemE, 1997, 75, Part A, 792-796.

Identifiers

DOI

10.2478/v10026-008-0033-3