Advertisement

Springer Nature is making Coronavirus research free. View research | View latest news | Sign up for updates

Non-isothermal flow diagnostics using microencapsulated cholesteric particles

  • 37 Accesses

  • 11 Citations

Abstract

The temperature and the flow field of thermo-convective liquid flows are visualized using cholesteric liquid crystal material as tracer particles. This type of tracers offers the scientifically valuable feature of measuring the flow and the temperature field simultaneously. Three thermoconvective flow configurations have been investigated successfully using liquid crystals. The results are discussed in some detail. It turns out that the liquid crystal technique is a valuable tool for thermo-convective liquid flow analysis.

This is a preview of subscription content, log in to check access.

References

  1. 1.

    Raake, D., Siekmann, J. and Chun, Ch.-H., Temperature and velocity fields due to surface tension driven flow.Exp. Fluids 7 (1989) 164–170.

  2. 2.

    Wozniak, K., Wozniak, G. and Rösgen, T., Particle-image-velocimetry applied to thermocapillary convection.Exp. Fluids 10 (1990) 12–16.

  3. 3.

    Nozaki, T., Mochiziki, N., Kji, N. and Mori, Y.H., Applications of liquid-crystal thermometry to drop temperature measurements.Exp. Fluids 18 (1995) 137–144.

  4. 4.

    Cockayne, B., The melt growth of oxide and related single crystals.J. Cryst. Growth 42 (1977) 413–429.

  5. 5.

    de Gennes, P.G. and Prost, J.,The Physics of Liquid Crystals, 2nd ed. New York: Oxford University Press (1993).

  6. 6.

    Rösgen, T., Wozniak, K. and Wozniak, G., Image processing for laser speckle velocimetry using the 2-D fast Fourier transform.Appl. Opt. 29, 35 (1990) 5298–5302.

  7. 7.

    Oertel Jr., H. and Kirchartz, K.R., Laser-anemointerferometer for simultaneous measurements of velocity and density.Appl. Opt. 18, 22 (1978) 3535–3538.

  8. 8.

    Dabiri, D. and Gharib, M., Digital particle image thermometry: The method and implementation.Exp. Fluids 11 (1991) 77–86.

  9. 9.

    Vogel, B., Analyse der Energieströme beim Sieden unter Schwerelosigkeit. Ph.D. Dissertation, Technical University of Munich, Munich, Germany (1994).

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Wozniak, G., Wozniak, K. & Siekmann, J. Non-isothermal flow diagnostics using microencapsulated cholesteric particles. Appl. Sci. Res. 56, 145–156 (1996). https://doi.org/10.1007/BF02249378

Download citation

Key words

  • liquid crystals
  • buoyant and thermocapillary convection
  • flow visualization