A Comparison of Liquid Crystal Techniques for Transition Detection

Mee, D. J., Walton, T. W., Harrison, S. B. and Jones, T. V. (1991). A Comparison of Liquid Crystal Techniques for Transition Detection. In: AIAA 29th Aerospace Sciences Meeting, Reno, Nevada, (). 7-10 January, 1991.

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Author Mee, D. J.
Walton, T. W.
Harrison, S. B.
Jones, T. V.
Title of paper A Comparison of Liquid Crystal Techniques for Transition Detection
Conference name AIAA 29th Aerospace Sciences Meeting
Conference location Reno, Nevada
Conference dates 7-10 January, 1991
Publication Year 1991
Sub-type Fully published paper
Issue 91-0062
Abstract/Summary Two techniques for detection of boundary layer transition which employ liquid crystal coatings are compared for incompressible flow over a flat plate. Temperature sensitive liquid crystals are used to measure the characteristic increase in heat transfer coefficient through the transitional region on a uniformly heated surface. Shear sensitive liquid crystals are used to detect the high surface shear stress at the end of transition. The objective of this work was to assess the suitability of these techniques for transition detection in low speed flows. Both techniques can be used to locate transition and to obtain quantitative information about surface phenomena, but the destabilizing influence of heating in the first technique must be considered.
Subjects 290201 Aerodynamics
Keyword liquid crystals
boundary-layer transition
References 1. Hippensteele, S.A., Russel, L.M. and Stepka, F.S. 1983 "Evaluation of a method for heat transfer measurements and thermal visualization using a composite heater element and liquid crystals," Trans. ASME. J. Heat Trans. Vol. 105, No. 1, pp. 184-189. 2. Baughn, J.W., Takashi, R.K., Hoffman, M.A. and McKillas, A.A. 1985 "Local heat transfer measurements using an electrically heated thin gold-coated plastic sheet," J. Heat Trans., Vol 107, pp. 953-59. 3. Baughn, J.W., Hoffman, M.A. and Makel, D.B. 1986 "Improvements in a new technique for measuring and mapping heat transfer coefficients," Rev. Sci. lust., Vol. 57, pp. 650-654. 4. Ireland, P.T. and Jones, T.V. 1986 "Detailed measurements of heat transfer on and around a pedestal in fully developed channel flow," Proc. 8 Int. Heat Trans. Conf., San Francisco. 5. Byerley, A.R., Ireland, P.T. and Jones, T.V, 1988 "Detailed heat transfer measurements near and within the entrance to a film cooling hole," ASME Paper 88-GT-155. 6. Wang, Z., Ireland, P.T. and Jones, T.V. 1990 "A technique for measuring convective heat transfer at rough surfaces," ASME Paper 90-GT-300. 7. Gall, P.D. and Holmes, B.J. 1986 "Liquid crystals for high-altitude in-flight boundary layer flow visualization." A1AA Paper No. 86-2592. 8. Holmes, B.J. and Obara, C.J. 1987 "Advances in flow visualization using liquid-crystal coatings," SAE Paper 871017. 9. Bonnet, P., Jones, T.V. and McDonnell, D.G. 1989 "Shear stress measurements in aerodynamic testing using cholesteric liquid crystals," Liquid Cr^-stals, Vol. 6, No. 3. 10. Baughn, J.W., Ireland, P.T., Jones. T.V. and Saniei, N. 1989 "A comparison of the transient and heated-coating methods for the measurement of local heat transfer coefficients in a pin fin," J. Heat Trans., Vol. Ill, pp. 877-881. 11. Schlichting, H. 1979 "Boundary layer theory," 7th Ed., McGraw-Hill, New York. pp. 514-516. 12. Young, A.D. and Paterson, J.H. 1981 "Aircraft excrescence drag," AGARDograph No. 264. 13. Crawford, M.E. and Kays, W.M. 1976 "STAN5 - A program for numerical computation of two-dimensional internal and external boundary layer flows," NASA CR-2742, Nov. 1976. 14. Kirn, J., Simon, T.W. and Kestoras, M. 1989 "Fluid mechanics and heat transfer measurements in transistional boundary layers conditionally sampled on intermittency," 1989 National Heat Transfer Conference, HTD-Vol. 107, Heat Transfer in Convective Flows. 15. Schubauer, G.B. and Klebanoff, P.S. 1955 "Contributions on the mechanics of boundary layer transition," NACA TN 3489, Sept. 1955. 16. Clark, J.P. and Jones, T.V. 1991 "On the heat transfer distribution in a turbulent wedge," submitted for publication.
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes Paper number AIAA-91-0062

Document type: Conference Paper
Collection: School of Mechanical & Mining Engineering Publications
 
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