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In recent years thermochromic liquid crystals (TLC) have been successfully used in non-intrusive heat transfer and fluid mechanic studies. Thin coatings of TLC's at surfaces are utilised to obtain detailed heat transfer data of steady or transient process. Application of TLC traces allows instantaneous measurement of temperature and velocity fields for two-dimensional cross-section of flow. Computerised flow visualisation techniques allow automatic quantification of temperature of the analysed surface or the visualised flow cross-section. Here, we describe our experience in applying the method to selected problems studied in our laboratory. They include modelling of flow configurations in the differentially heated inclined cavity with vertical temperature gradient simulating up-slope flow as well as thermal convention under freezinf surface. The main aim of these experimental models is to generate reliable experimental database on velocity and temperature fields for specific flow. The methods are based on computerised true-colour analysis of digital images for temperature measurements and modified particle image velocimetry and thermometry (PIVT) used to obtain the flow field velocity.
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Czasopismo
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Tom
Strony
1--10
Opis fizyczny
Bibliogr. 15 poz.
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autor
autor
- Faculty of Mechanical Engineering, Technical University of Gdańsk, 11/12 Narutowicza Str., 80-952 Gdańsk, Poland, jstasiek@pg.gda.pl
Bibliografia
- 1. W. J. Hiller, S. Koch, T. A. Kowalewski, and F. Stella, "Onset of natural convection in a cube", Int. J. Heat Mass Transfer 36, 3251-3263 (1993).
- 2. T. A. Kowalewski and A. Cybulski, "Experimental and numerical investigations of natural convection in freezing water", Int. Conf. on Heat Transfer with Change of Phase in Mechanics, Kielce, Vol. 61, 7-16 (1996).
- 3. T. A. Kowalewski, A. Cybulski, and M. Rebow, "Particle image velocimetry and thermometry in freezing water", 8th Int. Symp. on Flow Visualisation, Sorrento, edited by G. M. Carlomagno and I. Grant, CD ROM Proc, Edinburgh, 24.1-24.8 (1998).
- 4. T. A. Kowalewski and M. Rebow, "Freezing of water in the differentially heated cubic cavity", Int. J. Comp. Fluid Dyn. 11, 193-210 (1999).
- 5. J. Stasiek and M. W. Collin, "The use of liquid crystal and true-colour image processing in heat and fluid flow experiments", Atlas of Visualisation, Vol. 2, CRC Press, Inc, 1996.
- 6. N. Akino, T. Kunugi, Y. Shiina, K. Ichimiya, and A. Kurosawa, "Fundamental study on visualisation of temperature fields using thermosensitive liquid crystals", in Flow Visualisation V, pp. 87-92, edited by R. Reznicek, Hemiphere Publishing Corp. Washington, 1990.
- 7. B&H Liquid Crystal Devices Ltd, London (1992).
- 8. Data Translation Ltd: Image Processing Handbook (1991).
- 9. J. W. Baughn and X. Yan, "Liquid crystal methods in experimental heat transfer", Proc. 32nd Heat Transfer and Fluid. pp. 15-40, Mechanics In titute Sacramento, CA (1991).
- 10. R. J. Moffat, "Describing the uncertainties in experimental results", Experimental Thermal and Fluid Sciences 1, 3-17 (1988).
- 11. R. J. Moffat, "Experimental heat transfer", Proc. 9th Int. Heat Transfer Conference, Jerusalem, Vol. 1, 308-310 (1991).
- 12. T. V. Jones, Z. Wang, and P. T. Ireland, "The use of liquid crystals in aerodynamic and heat transfer experiments", Proc. 1st I. Mech. E. Seminar on optical methods and Data Processing in Heat and Fluid Flow, City University, London, 51-65 (1992).
- 13. S. Ashforth-Frost, L. S. Wang, K. Jambunathan, D. P. Graham, and J. M. Rhine, "Application of image processing to liquid crystal thermography", Proc. 1st I. Mech. E. Seminar on Optical Methods and Data Processing in Heat and Fluid Flow, City University, London, 121-126 (1992).
- 14. J. Stasiek, "Thermochromic liquid crystals and true colour image processing in heat transfer and fluid flow research". J. Heat Mass Transfer 33, 27-29 (1997).
- 15. W. Leiner, K. Schulz, M. Behle, and S. Lorenz, "Imaging techniques to measure local heat and mass transfer", Proc. 3rd I. Mech. E. Seminar Optical Methods and Data Processing in Heat and Fluid Flow, City University, London, 1-13 1996.
Typ dokumentu
Bibliografia
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bwmeta1.element.baztech-article-BWA2-0006-0066