Flow Visualization of Liquid Crystalline Polymer Solutions in Rectangular Channels

  • S. Guido
  • N. Grizzuti
  • G. Marrucci
Conference paper


Velocity profiles of aqueous solutions of Hydroxypropylcellulose flowing in rectangular channels were visualized by means of an electrochemical technique. Isotropic and anisotropic solutions were used. The velocity profiles of the liquid crystalline solution were found to be qualitatively different from those of the isotropic one. In particular, anomalous maxima in the velocity near the side walls were observed.


Velocity Profile Flow Visualization Rectangular Channel Liquid Crystalline Polymer Thymol Blue 
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  1. 1.
    Viney, C.; Donald, A. M.; Windle, A. H.: Molecular correlations in sheared thermotropic copolyesters showing banded textures. Polymer 26 (1985) 870–878.CrossRefGoogle Scholar
  2. 2.
    Maffettone, P. L.; Grizzuti, N.; Marrucci, G.: Band formation in HPC solutions by consecutive shears along orthogonal directions. Liq. Cryst. 4 (1989) 385–391.CrossRefGoogle Scholar
  3. 3.
    Onogi, Y.; White, J. L.; Fellers, J. F.: Rheo-optics of shear and elongational flow of liquid crystalline polymer solutions: hydroxypropyl cellulose/water and poly-p-phenylene terephthlamide/sulfuric acid. J. Non-Newt. Fluid Mech. 7 (1980) 121–151.CrossRefGoogle Scholar
  4. 4.
    Meeten, G. H.; Navard, P.: Cholesteric hydroxypropylcellulose solutions: microscopy and small-angle light scattering. J. Polym. Sci.: Polym. Phys. 26 (1988) 413–419.CrossRefGoogle Scholar
  5. 5.
    Takebe, T.; Takeji, T.; Ernst, B.; Navard, P.; Stein, R. S.: Small-angle light scattering of polymer liquid crystals under shear flow. J. Chem. Phys. 92 (1990) 1386–1392.CrossRefGoogle Scholar
  6. 6.
    Grizzuti N., Guido S., Nastri, V. and Marrucci, G.: Velocity profiles in rectangular channel flow of liquid crystalline polymer solutions. Rheol. Acta 30 (1991) 71–76.CrossRefGoogle Scholar
  7. 7.
    Schraub, F. A.; Kline, S. J.; Henry, J.; Runstadler, J. W., Jr.; Littell, A.: Use of hydrogen bubbles for quantitative determination of time-dependent velocity fields in low speed water flows. J. Basic Eng., Trans. ASME, Series D, 87 (1965) 429–444.CrossRefGoogle Scholar
  8. 8.
    Baker, D. J.: A technique for the precise measurement of small fluid velocities. J. Fluid Mech. 26 (1966) 573–575.CrossRefGoogle Scholar
  9. 9.
    Guido, S.; Marrucci, G.; Grizzuti, N.: S-shaped deformation profiles in sheared liquid-crystalline polymers. Liq. Cryst. 7 (1990) 279–281.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1992

Authors and Affiliations

  • S. Guido
    • 1
  • N. Grizzuti
    • 1
  • G. Marrucci
    • 1
  1. 1.Dipartimento di Ingegneria ChimicaUniversità di Napoli Federico IINapoliItaly

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